If Unbutu was a bit more installation friendly I would dump microshaft in a second.
Unbutu just screams for speed
I use Ubuntu (not Unbuntu) on my netbook. Very simple installation, screams with speed, automatically updates to latest software, no viruses, (no long drawn out virus scans).
Spent $230 on the netbook, $0 for the software. (If it dies I throw it away) It does just about everything I need to do. What more do you want?