Ha! That one turned out rather well. I tried "BROWSER", and it came out looking like "BIGWIG". On the whole, though, that ambigram generator is the best I've seen so far.
@erco, your experience with Fortran and punch cards sounds like my own. What was really fun is getting an infinite loop in Fortran and see how long it took the Computer Lab Assistant to shut down the IBM printer! I nearly used up a forest of trees in my college days with those printouts.
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http://www.flipscript.com/ambigram-generator.aspx
-Phil