Leopard brings a quicker way to switch between Mac OS X and
Windows: Just choose the new Apple menu item “Restart in Windows.”
Your Mac goes into “safe sleep” so that when you return, you’ll be
right where you were. It’s much faster than restarting the
computer each time. Likewise, a “Restart in Mac OS X” menu item in
the Boot Camp System Tray in Windows makes for a faster return to
Mac OS X. With Windows hibernation enabled, you can pick up where
you left off.