Yay I'm last
If you want to be specific, it's an Atom N280. Actually that Acer's getting replaced due to a flaw with the keyboard... And that "M 540" is a Celeron.
Hmm...and now with this list, I'm tempted to push this processor a bit more. I've yet to try anything above 3.3GHz
BTW... I wish I still had some slower computers, but my slowest is a 386SX/25MHz. I could see about running superpi on there sometime :3