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Maybe these have already been posted, but just in case: http://www.johnlangdon.net/website/New_Pages/Ambigrams.htm
Nice logos also: http://www.johnlangdon.net/website/New_Pages/Logo_Design.htm Thanks Pixelsurgeon: http://www.pixelsurgeon.com/
The John Langdon site (along with Scott Kim’s cool stuﬀ) were mentioned in this other thread last week, actually. http://www.typophile.com/forums/messages/30/17882.html