Here’s a super fast way to find your serial number… go to the Apple menu on the menu bar and select “About This Mac”. Here’s what you’ll see.Below “Mac OS X” you’ll see which version of OS X you’re running. Click on the version number to show the software build number, and click on it again to show your serial number. This also works on the OSX login screen, but you’ll see even more information if you keep clicking, including date and time, network connections, etc.
Kevin Dern – OSX – Leopard – Apple – Mac