http://www.macrumors.com/2009/03/03/apple-issues-airport-admin-utility-and-client-software-updates/

Apple today released several software updates related to its AirPort networking products. The updates are presumably related to this morning's release of new AirPort Extreme and Time Capsule products bringing several new features.

AirPort Client Update 2009-001 is targeted at for all Intel-based computers running OS X 10.5.6 and is said to address "issues with roaming and network selection in dual-band environments." The update weighs in at 2 MB.

AirPort Utility 5.4.1 (17.4 MB) and AirPort Utility 5.4.1 Windows (10.92 MB) provide updated setup and management tools for the AirPort Express Base Station, AirPort Extreme Base Station and Time Capsule. No specific details on changes present in the updates are given, although they presumably incorporate new features allowing users to administer the updated AirPort Extreme Base Station and Time Capsule models introduced today.

updates are good

not always