Actually, a lot of laptops including Macs do have an accelerometer. They use it to detect possible impacts and park the hard drive heads. Probably will be goin

Actually, a lot of laptops including Macs do have an accelerometer. They use it to detect possible impacts and park the hard drive heads. Probably will be going away with SSDs. http://support.apple.com/kb/HT1935 http://support.apple.com/kb/HT1935