Windows: If you use multiple OSes and prefer using an Apple keyboard you'll know that many Windows key options such as PrtSc do not work in Windows. Apple Wireless Keyboard Helper is a free executable program that restores many of those keys.
Despite the name of the software, it works with both wired and wireless Apple keyboards. After running the program these combinations will be accessible in Windows:
F4: Task Manager
F7-F9: iTunes control
F10-F12: System volume Control
Eject button toggles Fkeys/Functions.
Fn + F key triggers function (useful when in F keys mode)
Fn + Backspace = Delete
Fn+ Eject: Eject CD
If you ever use an Apple keyboard in Windows you should definitely give this little program a try.