I've got a Gateway convertable tablet and, combined with Microsoft Onenote, it's brilliant for taking notes. I can leave it in the keyboard configuration for the most part, but if a professor starts drawing a figure, I can quickly and easily include it next to my typed notes. It's also easy to change ink colors and move drawings around with the lasso tool. (This really helped during a particularly fast figure-drawing explanation of how reverse transcriptase does its thing....) This program also syncs up audio recordings with keyboard strokes, so if you want to hear a particular part of the lecture again, just click an icon next to the relevant notes, without having to search through the recordings.
I'd love it if UTHSCSA picked it for our pc option (we get to choose between pc or Mac), but I'm not holding out too much hope...
(I think Dell just came out with one as well, but it's much more expensive)