There is a strong focus on multi-touch interaction in HCI. Experimental multi-touch interfaces have been around since 1982. The first multi-touch display was based on finger pressure technology. A multi-touch table uses a very simple method for tracking the finger/object touches/movement on a surface screen. It takes advantage of a cameras ability to see a greater spectrum of light then the human eye, extending into the infrared spectrum. There are 4 major multi-touch surface interface solutions: Microsoft Surface, Perspective Pixel, TouchLib, and TBeta. These solutions implement a design that can host complex high performance applications. The solutions provide control of multi-screen projection and control of audio and visual events. Microsoft Surface uses a design that is based on a standard IKEA table and has a projector light diffuser in the center of the table. One of the most famous solutions is Perspective Pixel designed by Jeff Han. Jeff Han is arguably one of the major pioneers of multi-touch surface computing, because of his ability to promote multi-touch surface computing. The solution uses the total internal reflection method (FTIR). The two major open source alternative solutions are TouchLib and TBeta. These solutions can track finger touches and translate the input into standard HID (Human Interface Device) events.
Some Surface Computing and Multi-Touch Interface Links: