Standard kybds. shouldn't cause a problem. HOWEVER, if you have a kybd. that uses a driver or special setup pgm. then expect a bleak future. Thus, it *may* need some Vista driver release or patch. Then again, if this is a common kybd. it should be ok. Overall, I haven't seen any issues, but as you noted, "some compatibility issues" can crop-up on a new OS release.
Now that Windows Vista is here, I've been hearing about some compatibility issues. Anyway, I'm just wondering if keyboards designed for XP tend to have any problems in Vista.