Im not sure whether this is a mac thing or not, but iv discovered quite an odd problem with my mac mini (Dell 10V really
If you use the mouse, and then press any button on the keyboard, the mouse cursor will pause its position for about half a second and then continue.
To test this, spin the mouse cursor by making continuous circles on the touchpad. While you are doing this, hit one of the letter keys. Id be interested to see who else seems to have this problem...
Iv been also having intermittent kernel panics (about 1 a week under heavy usage) whilst I am scrolling up and down in firefox using the keypad.
I have a totally standard 10v that I bought from dixons about a week ago (1 gig ram, upgraded to 2) 160GB wester digi HD, Atom n270).