Just picked up my little Acer the week before Black Friday. Once I got it home I upgraded a few things. I found the memory for $28.00 and had the HD already.
Acer Aspire One D255
Atom N450 1.66Ghz CPU
2GB 667mhz Crucial memory (upgraded from 1GB)
500GB Scorio Blue HD (upgraded from 160GB Toshiba)
10.1" 1024 x 600 LCD
It came with XP, I added a Linux distro as a dual boot.
I love this little sucker!