I plan on doing something similar to a 12" Powerbook G4 I just purchased.

I found this on Ebay and was planning on replacing the existing 12.1" XGA display with that.

It comes with a wacom digitizer, probably 256 or 512 levels of pressure sensitivity, I havn't looked too hard yet.

If it'll work, it's a win-win. I'd have a little mac tablet, and a 1400x1050 desktop rather than 1024x768.

I think the iBook and the PB12" have the same sized display, just throwing that out as an option for you.