On another sidenote, here's something I just remembered. All of Microsoft's currently shipping keyboards that feature USB,* support using USB only to run the keyboard. Some of these keyboards simply say that they have a USB hub built in(such as the Internet Pro), but actually have USB controls built in, seemingly for the Mac market. There's mixed results on use, since it's not an official "feature" for Windows on some of the keyboards, but for those who are having problems, it's just Windows not recognizing the ability of the keyboard's USB to provide control. If you set your BIOS to control the keyboard(instead of the OS), you're fine.
A good number of people use MS keyboards according to the Systems Rig page, so when PS/2 is phased out, you should still be able to keep your keyboard.
* Only the MS Internet Keyboard(non-pro) and Wireless Desktop lack USB