Listpic finds posts to Oodle that contain pictures and allows one to easily browse through the posts by theses pictures. This uses data from eBay, Craigslist and Etsy. Formerly called listpic.
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flightwise (formerly fboweb.com)
Flickr Api Explorer
Yahoo! Search API Tutorial
APIs, mashups and code. Because the world's your programmable oyster.
Executive Editor, ProgrammableWeb. Author, Map Scripting 101. Lover, APIs.