This is my 45-inch HD multi-touch table that I designed and built a few months ago. It uses a HD video projector to display the video output form a PC running Windows 7 as well as custom tracking software using the Intel OpenCV computer vision library. I have to add, the O'Reilly publication "Programming Interactivity" was a huge help in getting this project off the ground!
I built this table to experiment with multi-touch applications built with Adobe AIR, Windows XNA Platform, Unity3D Game engine, etc.
I thought I had missed the deadline a couple weeks ago, then I read a blog entry from i3detroit that said it was extended. Sorry about the late submission.
One last note, I do not have a dedicated site built for this thing yet. I simply entered my personal site.