I'll start.
I'm running Oolite on a 4 or 5 year old Dell Latitude laptop - 1GHz PIII processor and 256MB RAM.
My refresh rate regularly drops to <10fps during combat, but in spite of that, I'm currently sitting on 980 kills.
(At the other end of the spectrum, my wife's laptop is a Dell 1720 with a 17" screen and GeForce 7800 graphics card. Gives me a chance to experience the eye candy!!!!)

