I would be interested (even in a PS2 one, and especially if they sometimes go for $12) but I'm a little off put by the 300 dpi rating.
Thanks Ripster I'd use it on my laptop, which is 1024*768, but I eventually plan to use it on my 1600*1200 monitor. Given the data, it'll take a revolution to cross the screen.
I've no experience with trackballs, but I imagine this to be bad.