opsdo has two goals - to allow people to search many information sources which mainstream search engines do not cover well and to allow people to search groups of such sources -- e.g. RottenTomatoes, IMDb and Amazon.
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flightwise (formerly fboweb.com)
Web 3.0 Is Here - Social Shopping
Flickr Api Explorer
Yahoo! Search API Tutorial
VB.Net Library for Amazon eCommerce
Using PHP with the Amazon eCommerce API
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APIs, mashups and code. Because the world's your programmable oyster.
Executive Editor, ProgrammableWeb. Author, Map Scripting 101. Lover, APIs.