BootChamp

If you've used Windows through Bootcamp on your Mac, BootChamp is a small tool for Mac OS X Leopard that lets you restart the computer directly in Windows, without having to press any keys during start-up.

BootChamp installs an icon on the menu bar, from which you can access the 'Restart into Windows' option. Warning: BootChamp will ask for the administrator's password, after which it will start up the computer.

BootChamp takes away the necessity of having to wait for the computer to start back up again.