Doodle Source gathers all Google logos worldwide the second they are changed and keeps an archive where you can browse older Doodles. You can even sort them by country, title and/or date.
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Smartest American Cities
Google APIlity Library
Performing automated language translations with Flex and Google
Build a Site Search with the Google Search API
Using the Google Web Services API with Flash
Some Google in Your Apps
Twitter4R - Ruby Twitter Binding
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Executive Editor, ProgrammableWeb. Author, Map Scripting 101. Lover, APIs.