[ale] Opinions on lightweight laptops?

[jb at sourceillustrated.com (John Wells)]

Guys,

I'm tired of lugging around my 8 lbs. Dell Inspiron and have decided to
purchase a more portable laptop.

I've been looking at Lenovo...they seem to compete in cost and offer a
wide variety. Those with 13.3" screens are appealing (they're roughly 3
pounds), yet I fear writing code, which is primarily what I use it for,
might be hard on such a low resolution.

Any recommendations? My only desires are: decently powerful, lightweight,
capable of running Ubuntu well.

Thanks,
John