Empoc has introduced Spy Lock 1.0, a Mac app that allows customers to lock and unlock their Mac. It requires Mac OS X 10.6.6 or higher, costs US$4.99 and is available worldwide through the Mac App Store in the Utilities category.
Utilizing the built-in iSight on most Mac computers, Spy Lock lets you know who’s tried to access your computer and when by taking a snapshot or video of the suspect at the same time that the unlock password was typed incorrectly.
Spy Lock keeps a log that can be accessed so that you can see who all has been at your computer trying to log in while you were away. Among other features you can choose to take a snapshot when the wrong password is entered or choose to record video when the screen is locked.