RetweetFollow lets you search by keywords in URLs tweeted and to easily follow the retweeters. You can also create lists, export the results, thank the RTs.
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flightwise (formerly fboweb.com)
GLive RSS Reader
Scripting Twitter with Perl
Yahoo! Search API Tutorial
Tutorial for a IP to geolocation aggregator script
Performing automated language translations with Flex and Google
Text Your Customers Now
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Executive Editor, ProgrammableWeb. Author, Map Scripting 101. Lover, APIs.