The Big List of APIs
This list is not complete. Please leave a comment if you know of any API's i've missed. I had these in a few text files so thought i'd combine them into a site - they might be useful for someone deciding they want to do an api mash up.
The categories are only rough.
Social Networking
http://apiwiki.twitter.com/w/page/22554648/FrontPage
http://developers.facebook.com/docs/
http://developers.facebook.com/docs/api/realtime/
Flickr
http://www.flickr.com/services/api/
Dribble
http://dribbble.com/api (contact them for commercial use of their api)
Information/Stats
The movie db api
Freebase
http://wiki.freebase.com/wiki/API
FanFeedr
http://developer.fanfeedr.com/ (only upto 25 requests an hr for free)
Spotify meta data api
http://developer.spotify.com/en/metadata-api/overview/
Information/Stats -> House/Rentals (real estate apis)
Oodle API
http://developer.oodle.com/oodle-api
Homefinder
http://developer.homefinder.com/
Information/Stats -> Food and drink
Wine.com
Translation, words
World lingo
http://www.worldlingo.com/en/products/worldlingo_api.html
Maps
Google Maps API
https://code.google.com/apis/maps/index.html
Yahoo maps
http://developer.yahoo.com/maps/
Bing Maps
https://www.microsoft.com/maps/developers/
Ovi maps
Shopping/ecommerce
Amazon.com
https://affiliate-program.amazon.com/gp/advertising/api/detail/main.html
eBay
Zappos.com
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