i've got a mini-itx p-m 1.6 dothan system i use at work that i built, it was not cheap to build but its fast and puts off very little heat
these cpus are very fast!
ibase mb 890 motherboard
dothan p-m 1.6ghz <---- lost a bid on ebay for a 5W 1.4ghz dothan chip so i settled with a 1.6ghz chip
512mb pc3200 (runs at 2100)
seagate momentous 40gb hd
dvd/cdrw laptop drive
the computer is only 4"X4"X8"!!!
and looks slick with a black 17" lcd
i will say that suse runs very fast on this setup, substantailly faster than winxp, but i have a feeling the ram has to do with that cause it uses shared memory for video (intel extreme grfx), 1gb stick would probably make it faster in winxp, but it definately runs faster than my ageing xp2ghz system