Apple has updated a couple of knowledgebase articles that may be useful for MacBook users. The articles cover how to enable and disable the built-in sudden motion sensor in MacBook and PowerBook computers, and also how to use the glass multi-touch track pad.
Apple included sudden motion sensor technology in PowerBook and MacBook computers to protect components such as hard drives when the computer is moved. Additionally, there are some third-party security programs that interface with the sensors, which will alarm when enabled if the computer is moved. Despite the conveniences, there are situations where the sensor may be inadvertently activated, causing the hard drive to repeatedly pause while it parks the drive heads. This KB article covers how to disable it in various MacBook and PowerBook models in various versions of OS X.
The multi-touch trackpads in Apple's MacBooks are built to be intuitive; however, I've seen a number of new users who inconvenience themselves by not using the trackpads properly by clicking with all fingers, or developing awkward two-hand methods for doing routine tasks. These articles cover the details on the trackpads, and how to best position your fingers when using them. For most people these will seem rather elementary, but if you are having troubles with tracking, they may be worth a brief read.