hmm, not really sure...
...i could have sworn it came across with the driver cd, but if you checked that, i dont know. but as i think about it, i didnt have a sp2 disc, so i used the slipstream method. i updated my sp2 on my pc, the[n,] along with my xp disc, created a "new" xp sp2 disc that i used to install xp on the mbp.
i'm pretty sure it [the driver] didnt come with refit. at any rate, yes, the mighty mouse works and i can even connect my windows mobile smart phone to sync using the missing sync from marc space. there is a bit of a delay (about 5-10secs) once i turn the mouse on, but after that, smooth sailing.
hope that helps.