This is the demo presented last month at TED. Researchers are from MIT Media labs, Pattie Maes, Fluid interface group with her student Pranav Mistry, the guy responsible for this future-gadget Sixth sense.
You can read details http://www.ted.com/index.php/themes/what_s_next_in_tech.html at TED’s official website.
I stumbleupon this amazing video of 8 feet touch screen of high performance computing.
In this video you’ll not only see multi-touch feature but some times you’ll notice two different activities performing four hands simultaneously, now thats some multi-tasking.
Perceptive Pixel multi touch
PS: I think I cannot embed it on my blog.
I dont have more infomation about this video, if you know about it’s background / history please share.