Summary: I travel a lot and had to choose between my Thinkpad T400 (fairly heavy) and my ASUS eeepc (slow). The Thinkpad 220i is light, has good battery life and is fairly powerful. Keyboard is the best I've seen on any small form factor laptop. The drawback is that it comes with Win 7 64 bit only. I have several legacy apps that run fine on Win 7 32, but here they are in the XP virtual machine. Not awful but an annoyance.
Pros: Comfortable Keyboard, Fast, Lightweight, Long Battery Life