I'm assuming that you probably could use a Windows wireless or USB keyboard - however, if you do go for a wireless, you'll have to use the 'Wireless dongle' that comes with the keyboard - unless you have bluetooth built in and get a bluetooth keyboard. I've recently got a Mac Bluetooth keyboard for my powerbook and it's fantastic
Before getting my bluetooth keyboard, I used a USB noname keyboard that was for windows, and found a program called 'DoubleCommand' (google it because I've no idea about where it is...) which was able to replace such things as the Windows button to the Mac option key etc - took a bit of playing around, but you should get there
Of course, if you're willing to spend a little extra, the Mac USB keyboards are good with 2 USBs built in as well as a hub, and all the keys will be there already - only a little bit extra to spend, but in a few months time you'll forget that it was a bit extra....