I have the Acer Aspire One AO751h (11.6", Atom Z520 1.33GHz) as I posted a while back.

My problem now is it's too 'effin slow!! Argh! Here are details:
OS: WinXP Home SP3
Browser: Firefox
Anti-Virus: AVG
Anti-Spyware: Spybot Search and Destroy
IM: Yahoo Messenger 8.1 (had to revert from ver.9 because is slows my system down)
Sidebar: Google Desktop (which I rely on weather, time, and news feeds)

Hardware:
Memory: 1GB
Processor: Atom Z520 1.33GHz
HD: 160GB

I'm thinking of upgrading to 2GB memory. Do you guys think it would improve my system?