Apple today released AirPort Update 2006-002 which improves AirPort compatibility in the following computers:
• MacBook Pro (15-inch Core 2 Duo)
• MacBook Pro (17-inch Core 2 Duo)
• MacBook (13-inch Core 2 Duo)
The update is available via Software Update and also as a standalone installer.
More info and download link (1.3MB) here.