WACOM Digitizer Pad
Select ThinkPads feature a WACOM Digitizer Pad in the palm rest.
Linux support
Help needed
If you have a ThinkPad with this and have gotten it to work, please update the instructions
I have submitted patches to linuxwacom and they need testing you can see this discussion here[1]
My patches and sources are here[2]
The WACOM Digitizer Pad may work with the standard Linux WACOM support in recent distributions.
The WACOM Digitizer Pad on the Thinkpad W700 works out of the box with Ubuntu 10.10. (Providing, of course, you know how to draw.)