This website gives you an easy interface to the App.net API. First you sign-up using your AppNet account. After sign-up you can use the console to try API queries and see the result in both JSON and rendered views.
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Hurricane Zone Finder
Yahoo! MapMaker for Microsoft Excel
APIs, mashups and code. Because the world's your programmable oyster.
Executive Editor, ProgrammableWeb. Author, Map Scripting 101. Lover, APIs.