Yeah, netbooks feel so much nicer running Windows 7 than Windows XP, but you're paying a secret price: your battery. On average, Windows 7 seems to suck all the life out of it 47 minutes faster than Windows XP.
It varies from netbook to netbook — Toshiba's NB205 withstood Windows 7's power greediness better than HP's Mini 311. It's somewhat expected though, with features like the fancier Aero user interface to name one probable cause. Personally, I'll take Windows 7 and the dead battery. [Laptop]