A directory of Twitter lists, listatlas shows you what's popular, fast-growing and new. You can also search by keyword and find Twitter lists.
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flightwise (formerly fboweb.com)
Twitter Friends Followers Analyzer
Yahoo! Search API Tutorial
RFacebook Ruby Gem
Scripting Twitter with Perl
.NET Wrapper for Twitter API
Twyt - Python Interface to Twitter
Twitter Integration in phpLD
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Executive Editor, ProgrammableWeb. Author, Map Scripting 101. Lover, APIs.