Hi Nick,
We do have support for the Dell Latitude XT, but only through Windows
7. N-trig has yet to release a decent SDK, as far as I know, so we
can't access the device directly. However, if you're willing to
install the Windows 7 release candidate, you can download our Windows
7 driver and use that. We own a Dell Latitude XT and it works great.
4 points of touch w/ pretty good precision.
http://sparsh-ui.googlecode.com/files/SparshUI_Win7_Driver_0.1a.exe
Thanks,
Jay
Sparsh-UI Developer