Lock your Mac when it goes to sleep. SleepTight provides a simple way to lock your machine when it goes to sleep or lock from a keyboard hotkey. Surprisingly, OS X's built in screensaver does not start automatically when the machine goes to sleep. Since the screensaver is the only Apple-supplied method of locking your machine without logging out, this means that a machine which has been put to sleep may wake up unlocked if the screensaver did not start on its own before the sleep timeout. This is especially frustrating for PowerBook users, who typically put their machines to sleep by closing the lid. Since the lid closure doesn't start the screensaver, the PowerBook will awaken unlocked. Apple will be fixing this in the next version of MacOS X (10.3 Panther, see the new features). In the meantime Jaguar users can use SleepTight.