We've shown you how to reboot your Mac into Windows quickly with Quicksilver, but reader Dalton63841 shares a similar script that will let Boot Camp users do the same thing in Windows with just a double-click.
If you're a Mac user, your OS X volume is likely your default volume. That means when you reboot from Windows, you'll automatically boot back into OS X. If you'd like to reboot back into Windows (say, if you're rebooting because you had to install some $%@&#; Windows updates), just open up Notepad and paste the code below:
@echo off c:progra~1Bootca~1bootcamp.exe -StartupDisk "Windows" Shutdown /r /t 0
Where Windows is the name of your OS X startup volume. Save the file with a .bat extension (mine's called "Reboot Into OS X.bat") wherever you'd like. When you double-click on it, your computer will reboot right back into Windows, no Option key required.