Apple last night released the second software update for the AirPort Extreme. AirPort Extreme Update 2007-002 weighs in at 6.5MB and is recommended for all Intel-based Macs and "improves compatibility with AirPort Extreme base stations and networks."
This update also improves compatibility for the MacBook Core 2 Duo and the MacBook Pro Core 2 Duo when using certain third-party access points configured to use WEP Open System security.
This update also addresses a security issue outlined in Article ID: 305031:
Description: An out-of-bounds memory read may occur while handling wireless frames. An attacker in local proximity may be able to trigger a system crash by sending a maliciously-crafted frame to an affected system. This issue affects the Core Duo version of Mac mini, MacBook, and MacBook Pro computers equipped with wireless. Other systems, including the Core 2 Duo versions are not affected. This update addresses the issue by performing additional validation of wireless frames. Credit to LMH for reporting this issue.