Apple has released “Airport Extreme Update 2007-001” for some Intel-Macs.
From Apple Support Downloads:
AirPort Extreme Update 2007-001 – 6.5MB
This update is recommended for all Intel-based Macintosh computers and provides compatibility with AirPort Extreme base stations and networks.
According to MacNN, the update is intended for Intel-Macs with Core Duo Processor (MacBook, MacBook Pro, and Mac mini including Core Solo model).
If there’s any more updates, I’ll post it here asap.