Hi, don't know if you've made your decision, but if not here's a review of the T61 which may be of use: http://www.itreviews.co.uk/hardware/h1543.htm
The T61 has good reliability and build quality, but as another poster pointed out,...
Definitely check out the Witcher, well worth a look... (review here if you're interested: http://www.itreviews.co.uk/games/g391.htm )
Also note that a new version is coming out soon which fixes some of the problems, such as the very...
If you haven't made your ultra-portable decision yet, then there's a review of the R500 here which might help:
The battery life isn't impressive, apparently.
If you haven't already made your decision, there's a review here which might help you (comments on issues of game performance and battery life):
Hope that helps!