The IR Laser alternative

Even before finishing my own infrared led touch screen, but after trying other screens and tables built with the same kind of technology, Luis came up with very valuable information: 4 Infrared lasers provided with special line generators, and placed in the corners of the screen can substitute the endless rows of leds and the soldering that they implied.
Again, a very generous group of people related to NUI group have posted the info on how to implement this formula online: http://labs.ideo.com/2009/02/11/hacked-rear-projection-tv-into-multitouc...

The principles are exactly the same than those of the previous version I was working on:
"The system has four IR lasers mounted in the corners. Each laser has a line generator on it (line generators are put on laser-levels to create a line of laser light). The four lasers produce a plane of infrared light across the entire surface of the screen. When a finger intersects this plane of light, the light illuminates it. We have two cameras inside the TV that look at the interior of the screen from the inside. These cameras have filters on them that only allow infrared light through. The cameras see the “blobs” of infrared light and track these points."

However, instead of touchlib, these guys used NUI's Tbeta software which seems to replace, both touchlib and TUIO, probably integrating them in the code, I'm not sure. However this too is good news for me because while touchlib works only in Windows according to the download page, Tbeta works in MacOS which is the OS that use most of the time.
I can't wait to try this new approach!