Apple released AirPort Utility 5.3.2 for Mac OS X 10.4 and Mac OS X 10.5 on Wednesday. Appleis release notes state the update offers "Wireless networking that works with most Wi-Fi enabled devices, including Mac, PC, iPhone, iPod touch, and more."
AirPort Utility 5.3.2 is intended for setting up and configuring Use the AirPort Express Base Station, AirPort Extreme Base Station, and Time Capsule. It is free and available via the Software Update application, or as a downloadable installer at the Apple Support Web site.