http://www.macrumors.com/2008/06/11/apple-releases-airport-utility-5-3-2/
Apple today released "AirPort Utility 5.3.2," available via Software Update or from the Apple Downloads page. No specific details on changes to the software have been announced.
AirPort Utility is used to setup and configure AirPort Express and AirPort Extreme base stations, as well as Time Capsule.
Apple AirPort Utility 5.3.2 for Leopard (8.8 MB)
AirPort Utility 5.3.2 Tiger (9.3 MB)
AirPort Utility Setup 5.3.2 for Windows (10.3 MB)