I think the Q1 Pentium battery life is about the same as the original Q1 Celeron or maybe a tiny bit better since the processor has speedstep technology. But it can also be shorter depending on use since the Pentium has a faster CPU and chipset (cpu is rated 3-5w so it would then be the chipset that uses more power since e.g. 3d graphics is faster on this one).
The Pentium edition is supposedly also kitted with the same screen as the original Q1 Celeron. I think only the new Via version got the new screen from what I have read. The Pentium edition has all the same features as the original Celeron with ethernet, cf, stereo sound and array mic. In other words the most complete package since you also get a bigger drive and 1gb memory standard.
The screens on all the Q1 versions is very sensitive and you might experience vectoring problems. The new Via is supposedly a tiny bit better, but still I think the main focus for the Q1 is that its supposed to be operated easily with a finger and not require a stylus or fingernail to press anything. I think the TabletKiosk v7210 (also pentium) has a harder screen so it will have much less vectoring and making your inking a more pleasing experience.
I had a PDA and was never comfortable with inking on that, so chances are I wont do much inking on the UMPC either. I was more comfortable with onscreen keyboards and will probably get one where the whole width of the screen is a keyboard I can use my fingers on instead. If I do plan to ink it will be in the handwriting recognition area which will be all the way down on the bottom of the screen where I can rest my palm on the edge of the device to avoid vectoring.