Apple has issued a Trackpad Firmware Update for owners of the new MacBook and MacBook Pro.
This firmware update addresses an issue where trackpad clicks may not be recognized on MacBook (Late 2008) and MacBook Pro (Late 2008) systems.
When installation is complete, the updater application will launch automatically. Follow the instructions in the updater application to complete the update process. (If Software Update requires a restart, the updater application will launch after you log in.)
You can install the update by select Software Update from the Apple menu at the top left of your screen.