Apple released AirPort Client Update for MacBook and MacBook Pro 1.0 late on Tuesday to address Wi-Fi reliability issues some users were experiencing after installing the Mac OS X 10.5.8 update. The update is available for specific pre-unibody MacBook and MacBook pro models.
Apple's AirPort Update for Pre-unibody Laptops
The update addressed performance-related AirPort issues when running on battery power. Late 2007, early 2008 and late 2008 13-inch MacBook owners, along with early 2008 15-inch MacBook Pro owners, and early and late 2008 17-inch MacBook Pro owners can install the update.
AirPort Client Update for MacBook and MacBook Pro 1.0 is a free update, and requires Mac OS X 10.5.8. It is available via Apple's Software Update application.