I just got a Thinkpad X31 and wanted to say how pleased I am with it. Great screen, nice keyboard, fast enough for what I do (mainly Word, Excel, email, web stuff, watching movies when travelling). Easy to carry at 3.6 lbs. 1.4ghz, 512mb, 60gb 7200rpm. It doesn't have a built-in optical drive, but I can easily plug in a USB drive at home and copy whatever I need.

Highly recommended.