[ILUG] Multitouch screens and Linux

[Braun Brelin]

Anyone on this list have any experience building and running multitouch
screens under Linux?
Specifically, I'm trying to find out the following:

1.  There are a number of different techniques for creating MT screens,
including Frustrated Total Internal Reflection,
    Front and Rear Diffused Illumination, and others.  Can anyone on this
list give me pointers as to strengths
and weaknesses of the different types of technologies, or at least point me
in the right direction?

2. I know that Microsoft is planning to support MultiTouch in Windows 7
(argh! blech!) but does anyone know
anything about the state of Multitouch with Linux?  Anyone have experience
creating software supporting MT under Linux?

Thanks

Braun