http://www.macnn.com/articles/09/03/03/airport.utility.update/
Apple updates AirPort Client, Utility
updated 03:50 pm EST, Tue March 3, 2009
AirPort Utility update
Following the launch of new AirPort Extreme and Time Capsule devices, Apple has released updates to the AirPort Client and AirPort Utility. The AirPort Client Update 2009-001 addresses issues with roaming and network selection in dual-band environments. The new wireless routers can simultaneously communicate across the 2.4GHz and 5GHz bands. The 2MB download is recommended for all Intel-based Macs running OS X 10.5.6.
AirPort Utility 5.4.1 is the latest version of Apple's installation and setup utility for the AirPort Extreme, AirPort Express and Time Capsule. The 17.4MB download requires Mac OS X 10.5.4 or higher.
