I have been annoyed ever since I got the Das keyboard that I no longer had an eject key in Boot Camp. With Mac, you can just hold F12, but in Windows, you have to open windows explorer, right click on the drive and eject it (and again to put it back in with the "close tray" command). However, I recently discovered this little piece of software: WinEject.
You can assign hotkeys to eject the drive (default is Shift + PageDown for eject, Shift + PageUp for close). I like it all few minutes I've been using it.