I'm thinking about buying a midi keyboard for use with GarageBand on my new iMac (Intel CPU). Since most of these keyboards are USB, I don't know if they'll work. I suppose they'll need drivers, but I can't find anything on this subject. Does anybody know anything about this?

I just checked m-audio's website and they still don't have intel compatable USB drivers for their keyboards up yet. but they do plan on supporting all their usb devices with intel-mac drivers as stated here:

http://www.macmusic.org/news/view.php/lang/EN/id/4061/

There are some keyboards that work with the Apple USB driver. My evolution keyboard works fine with intel iMac simply by plugging it in.