IBM/Lenovo Ultranav with trackpoint

This is a very low profile keyboard whose key features in my view are the integrated trackpoint and touchpad. This may or may not be a good feature depending on which aspects of computer usage cause you problems. If you have issues with your fingers (as opposed to wrists, elbows,etc.) the trackpoint is not good. I found it can quickly make the pointing finger quite sore. The touchpad is just your usual run of the mill touchpad but it did notably work quite well under linux, including scroll support,etc.

The key feel (at least on the several ultranavs I own) is not good- the keys snap in such a way as to recoil painfully on the fingers.