Hi again.
You *might* be able to run the windows version of the Pantone one under WINE. I doubt very much if the software could tune brightness / gamma automatically, but I'm sure you could do this manually (via xgamma etc) if you could get the information out of the colour profile these programs produce.
There's a page here:
http://www.colorvision.com/newsletter/2003-01-17.html
which seems to have some sort of Linux support for calibration devices.
The last page of this pdf:
http://www.colorvision.com/downloads...uguide-win.pdf
also mentions a Linux version.
Dave