Check this multitouch technology I developed with a friend.
It still a prototype, but the concept is valid

www.youtube.com/watch?v=jNCOs1TGwTY

It does not have the ghost points problem like capacitive, and can detect N points without problem. The dimensions of the prototype are big because we made it by hand and needed space to work, the actually size could be 3mm thick. This technology can be integrated to a LCD screen.
Also, this technology is very cheap, the prototype cost us US$20, and we estimate that the cost of do it in a 20'' screen is less than US$100

I promess to send one with audio next time Smiley