Goodbye Buddy!, as the name suggests, will send u Direct Message notifications whenever someone unfollows u. http://ping.fm/muviY

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ZellR allows Twitter users to link their Twitter account with Facebook, Twitpic, RSS and others. http://zellr.com/

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Proxifeed creates and broadcasts automated postings into your Twitter feed. http://ping.fm/dz94P

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TwitPrint is a Twitter printer. You can use it to format your tweets in a simple manner that makes it easy to print. http://twitprint.com/

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FollowFormation makes the task of finding and following like minded people easy. http://ping.fm/YANyu

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TwtMaps is a mashup that allows you to enter your twitter name and get a map that shows all your friends locations.

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Roostr is a free flat-share listing site for UK Twitter users. http://ping.fm/cFej3

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