Erling Ellingsen made his own homebrew multi-touch interface from a plastic bag, blue dye, and an iSight camera. It's called the dyeSight. 
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There's a nice open source multi-touch project here
http://macrone.de/multitouch/
I think this is the multi-touch library they used
http://www.whitenoiseaudio.com/touchlib/
And this is how they built their table
http://dundee.cs.queensu.ca/wiki/index.php/Building_a_Multi-Touch_Sensitive_Table
Angstrom, very cool!