Flip My Tweet, as the name suggests, lets you flip the text that you type upside down! http://ping.fm/tzPlE

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Sideline is an Adobe AIR desktop application built with the Yahoo! User Interface Library (YUI). http://ping.fm/81MLe

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GuessWord is a game running on Twitter! You need to guess the mystery word in this never-ending tweeting game. http://ping.fm/glmcg

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Map My Tracks is the easy way 2 accurately track or share in real-time, ur activity direct 2 Twitter from a mobile phone.http://bit.ly/rXOQc

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The Twitterhood Quiz is a daily quiz on Twitter that starts at a particular time. http://ping.fm/OCxxg

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