A través de Digg me encuentro con un completo listado de APIs Web 2.0, seguro que os resultará muy útil, lo reproduzco aquí:
Advertising
| Google AdSense |
Administración de publicidad con Adsense |
| Google AdWords |
Anunciarse en buscador Google |
| Microsoft adCenter |
Servicios de publicidad online de Microsoft |
| UrlTrends |
Optimización de búsqueda y seguimiento de enlaces |
| Wordtracker |
Search engine optimization services |
| Yahoo Ads |
Administración de anuncios online de Yahoo |
| Yahoo Search Marketing |
Plataforma de publicidad en búsquedas |
| Answerbag |
Questions and answers service |
| Blogwise |
Blog and feed search service |
| SplogSpot |
Database of spam blogs |
Blog Search
| Blogwise |
Servicio de búsqueda en blogs y feeds |
| SplogSpot |
Base de datos de blogs de spam |
| Tailrank |
Blog search and news aggregation service |
| Technorati |
Servicio de búsqueda en blogs |
Blogging
Bookmarks
| Blogmarks |
Social bookmarking |
| del.icio.us |
Social bookmarking |
| linkaGoGo |
Social bookmarking service |
| Ma.gnolia |
Social bookmarking service |
| OnlyWire |
Social bookmarklet service |
| Shadows |
Social bookmarking and community |
| Simpy |
Social bookmarking |
Calendar
Chat
Community
| Blue Dot |
Content sharing community |
| coRank |
Distributed user reviews service |
| Facebook |
Social networking service |
| PartySpark |
Social events service |
| RockYou Super Wall |
Content sharing platform within Facebook |
| Twitter |
Community site |
Email
Enterprise
Events
| Eventfinder |
Calendario de Eventos |
| Eventful |
Events discovery and demand |
| Spraci |
Events and clubs database |
| Upcoming.org |
Collaborative event calendar |
| Zvents |
Local events search and community |
Financial
Government
| Cicero |
Lookup service for US elected officials by address |
| Civic Footprint |
Political geography lookup for Illinois |
| Democracy In Action |
Advocacy services for nonprofits |
| FedSpending.org |
Database of US government spending |
| Follow The Money |
Database of US campaign contributions |
| GovTracker |
Rhode Island state data services |
| LOUIS |
US federal documents database |
| Open Patent Services |
European Patent Office web services |
| Sunlight Labs |
US Congress database service |
| TheyWorkForYou |
Track the UK Parliament |
| Who is my Representative |
Database of US congressional representatives |
Internet
| Alexa Site Thumbnail |
Thumbnail images of web site home pages |
| Alexa Top Sites |
Web site traffic rankings |
| Amazon EC2 |
Elastic Compute Cloud virtual hosting |
| Clicky |
Servicio de estadísticas para sitios web |
| Compete |
Internet web site metrics and analytics |
| Cordurl |
Geo coordinate translation |
| Dapper |
Service for API creation |
| Domain Tools |
Internet domain name lookup |
| Durl.us |
URL shortening |
| Ecommstats |
Web analytics |
| Hostip.info |
IP lookup |
| HTML2PDF |
HTML to PDF conversion |
| Internet Archive |
Non-profit Internet library |
| IP Address Lookup |
Determine IP address from domain name |
| Mint |
Web site metrics and reporting |
| Mon.itor.us |
Web site monitoring services |
| MyNotify |
Feed publication |
| Nenest |
Web forms and application framework |
| Outune |
Web map engine |
| Pingdom |
Web site monitoring and reporting |
| Qurl |
Redirección de URL |
| SoftLayer |
Systems management and monitoring |
| UnAPI |
Proposal for web clipboard |
| W3Counter |
Web site metrics tools |
| Webride |
Attaches discussions to any site |
| WebThumb |
Thumbnail image generation |
| Windows Live Custom Domains |
Web site administration |
| Yahoo Site Explorer |
Web site analysis service |
Job Search
| Indeed |
Job search services |
| SmashFly |
Job board posting service |
Mapping
| ArcWeb |
Mapping and GIS services |
| BigTribe |
Location based advertising |
| deCarta |
Location-based services |
| EarthTools |
Web services for geographical information |
| FeedMap |
Blog geo-coding |
| Garmin MotionBased |
GPS services and mapping |
| geocoder |
Geocoding services for US |
| geocoder.ca |
Geocoding services for Canada |
| GeoIQ |
Geospatial analysis and heat mapping service |
| GeoNames |
Geographic name and postal code lookup |
| GetMapping |
Aerial photography and mapping service |
| GlobeXplorer |
Mapping services |
| Google Maps |
Mapping services |
| HopStop |
Mass transit and walking directions |
| iShareMaps On Demand |
UK Postcode Geocoder |
| Map24 AJAX API |
Mapping services |
| Mappr |
Photo mapping |
| MapQuest |
Online mapping service |
| Mapstraction |
Mapping API abstraction layer |
| MetaCarta |
Location and geotagging services |
| Microsoft MapPoint |
Mapping services |
| Microsoft Virtual Earth |
Mapping services |
| Multimap |
Global online mapping service |
| NASA |
Satellite mapping images |
| Naver Maps |
Korean mapping service |
| Nearby.org.uk |
Geocoding service for UK |
| Ontok |
Geocode any US address |
| OpenLayers |
Mapping API abstraction layer |
| OpenStreetMap |
The Free Wiki World Map |
| Platial |
Collaborative geographic service |
| Plazes |
Location discovery service |
| Poly9 FreeEarth |
3D mapping service |
| Pushpin |
Mapping service |
| Urban Mapping |
Urban geo-spatial data services |
| USGS Elevation Query Service |
Determine elevation based on latitude and longitude |
| ViaMichelin |
Mapping, directions, and travel booking |
| Wayfaring |
Map creation and sharing service |
| WHERE GPS |
Mobile GPS widget platform |
| Where Is Tim Web Service |
Location tracking |
| Where2GetIt Geospatial |
Non-mapping geospatial services |
| Where2GetIt SlippyMap |
Online mapping service |
| Whereis |
Australian and New Zealand mapping service |
| Wigle |
Wireless network mapping |
| Yahoo Geocoding |
Geocoding services |
| Yahoo Map Image |
Map image creation service |
| Yahoo Maps |
Mapping services |
| ZeeMaps |
Embedded maps and international geocoding |
| ZoomIn |
Australian mapping service |
Media Management
| BBC |
Multimedia archive database |
| Grouper Video |
Video sharing service |
| Orb |
Digital media remote access and management |
| Phanfare |
Photo and video sharing service |
| Streamload |
Online media storage |
Medical
| cPath |
Medical database lookup |
| Kegg |
Bioinformatics data services |
| NCBI Entrez |
Life sciences search services |
| SeqHound |
Bioinformatics research database |
Messaging
| 411Sync |
SMS, WAP, and email messaging |
| Aql |
SMS solutions portal |
| Clickatell |
SMS Messaging services |
| Jaiku |
Social messaging service |
| Mobivity |
SMS marketing messaging service |
| Movil |
SMS messaging |
| PartySync |
Messaging services |
| Sabifoo |
IM to RSS conversion service |
| SmsBug |
SMS messaging services |
| StrikeIron Global SMS Pro |
SMS messaging services |
| StrikeIron Mobile Email |
Mobile email messaging service |
| Textamerica |
Moblogs |
| Trekmail |
Messaging services |
| Twittervision |
Location based data for the Twitter service |
| Userplane |
Communication software for online communities |
| Vazu |
SMS messaging service |
Music
| AOL Music Now |
Music playlist management |
| Digital Podcast |
Podcast search |
| Faces.com |
Photo and media sharing service |
| Feedcache |
Feed caching service |
| Freedb / CDDB |
Online CD catalog service |
| Last.fm |
Music playlist management |
| MP3Tunes |
Music services |
| MusicBrainz |
Music metadata community service |
| MusicDNS.org |
Music fingerprinting service |
| MusicMobs |
Social music service |
| OpenStrands |
Music recommendation and discovery |
| Rhapsody |
Online music services |
| SeeqPod |
Music recommendation service |
| SNOCAP |
Digital music marketplace |
| Soundtoys |
Visual artists works repository |
| Tunelog |
Music metadata management |
| WebJay |
Music playlist management |
| Winamp |
Customizable music player |
| Yahoo Music Engine |
Desktop music player |
News
| AmphetaRate |
News aggregator |
| ClearForest Semantic Web Services1 |
Natural language processing tools |
| Daylife |
Online News Service |
| Digg |
|
| Findory |
Personalized news aggregation |
| Macromedia News Aggregator |
Data access service |
| Moreover |
News delivery |
| NewsCloud |
Social news service |
| NewsIsFree |
Online news aggregation |
Office
| Backpack |
Online information manager |
| Big Contacts |
Web based contact management |
| EditGrid |
Online spreadsheet |
| Google Documents List |
Document management services |
| Google Spreadsheets |
Online spreadsheets |
| Numbler |
Online spreadsheet service |
| SlideShare |
Presentation sharing community |
| Zoho |
Online office suite |
Photos
| AOL Pictures |
Online photo management |
| Buzznet |
Photo sharing |
| Flickr |
Photo sharing service |
| Fotolia |
Royalty free stock photos |
| Google Picasa |
Photo management and sharing service |
| imageLoop |
Animated slideshow service |
| Panoramio |
Photo upload site with organizer |
| Pixagogo |
Online photo services |
| Riya |
Photo search |
| ShutterPoint |
Stock photography service |
| Smugmug |
Photo sharing service |
| Snipshot |
Online photo editing service |
| WebShots |
Photo sharing service |
| Yahoo Photos |
Online photo service |
| Zoto |
Photo sharing service |
Recommendations
| Criteo |
Distributed recommendation service |
| EasyUtil |
Recommendation service |
| RapLeaf |
Portable ratings system |
| Yelp |
Local user reviews and city guides |
Reference
Search
Shopping
Storage
| Amazon S3 |
Online storage services |
| Box.net |
Online file storage |
| MoveDigital |
File delivery and management services |
| Omnidrive |
Online storage services |
| Open Xdrive |
Online data storage service |
| Openomy |
Online file system |
| Tagalag |
Email tagging |
| TagFinder |
Tag extraction service |
| Tagthe.net |
Tag recommendation service |
| TagTooga |
Tag based Internet directory |
Video
| Truveo |
Video search |
| Blinkx |
Video search |
| Dave.TV |
Video distribution network |
| LiveVideo |
Video repository and user community |
| Revver |
Video services |
| Veoh |
Virtual television and video network |
| Video Detective |
Film trailers, cast, images, and related information |
| Yahoo Video Search |
Video search |
| YouTube |
Video sharing and search |
Widgets
| ClearSpring |
Widget creation, distribution, and tracking services |
| Google Gadgets |
|
| Netvibes |
Personalized home page with widgets |
| Pageflakes |
Personalized start page and widgets |
| Serence Klip |
Desktop gadgets |
| SpringWidgets |
Widget platform |
| TagWorld |
Social web services |
| Windows Live Gadgets |
Online gadgets service |
| Windows Sidebar Gadgets |
Desktop gadgets |
| Yahoo Widgets |
Desktop widgets |
| Yourminis |
Personalized start page |
WIKI
| DBpedia |
Interfaz estructurada para solicitudes a Wikipedia |
| JotSpot |
Utilidad de colaboración con estilo Wiki |
| PBwiki |
Consumer wiki farm |
| WikiMatrix |
Servicio de búsquedas y comparaciones en Wiki |
vía: Techmagazine