I made a Multitouch table once which uses pymt library (thanks to <a href="http://www.nuigroup.com/" rel="nofollow">http://www.nuigroup.com/</a> ). It can be operated on linux but needed a custom-made multitouch table. The effort of synchronizing synaptic touchpad,which is most widespread touchpad with multitouch gestures is a worthy effort. Will be keeping tab on its progress.