SSD+*nix = ASUS 901, without a doubt. If you're comfortable with *nix, you can't beat their Debian/Xandros underpinnings, and if you don't like that, you can wait a bit for Ubuntu. Atom processor support is growing fast.

HP has a decent one in the XP Home class, Lenovo's "me to" is underwhelming. Avoid the Acer.