The Cool Pen Calculator lets you draw a calculator on any handy piece of paper, with the numbers and symbols in any order you wish, and then use that piece of paper like a calculator. It might be cooler if the calculator pen just told you, say, that 34x65=947,001.6 (or cooler still if it actually gave you the correct answer), but somehow what is actually does is the epitome of geek amusement. Where does one get one, pray tell, guys? [GT]
Cool Pen Calculator (YouTube video)
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It's called the LeapFrog's Fly Pentop computer. The official website can be found at http://www.flypentop.com/ and Mobility Guru has an in-depth review of the $99 thing at http://www.mobilityguru.com/2005/12/19/pentop_computing_is_more_than_a_kids/index.html
Thanks for a great site, by the way :)