What's the multi-touch:http://en.wikipedia.org/wiki/Multi-touch
The best website of multi-touch:http://nuigroup.com/
touchlib:http://www.whitenoiseaudio.com/touchlib/
the C++ library working Tbeta:http://www.openframeworks.cc/
MIRIA,a gate of tuio:http://www.generoso.info/index.php
TouchGateway,work the flash online:http://www.touchgateway.com/
touchless:http://www.officelabs.com/projects/touchless/Pages/default.aspx
Jeff Han,New York University,2006:http://www.cs.nyu.edu/~jhan/
Steve Hodges,Microsoft Research,2007:http://research.microsoft.com/en-us/people/shodges/
Surface,2007:http://www.microsoft.com/surface/index.html
University Pompeu Fabra:http://mtg.upf.edu/reactable/
Multitouch company:http://wiki.nuigroup.com/Multitouch_Business_Directory
Multitouch showcase:http://wiki.nuigroup.com/Community_Showcase_Directory
Multitouch applications and libraries:http://wiki.nuigroup.com/Applications_and_libraries
A company in HK:http://www.dbisinteractive.com/
A company in Shanghai:http://www.rexgo.net/