TidBits' Managing Editor, Jeff Carlson, writes with some information worth passing along:
Late yesterday, Apple released AirPort Driver Update 2004-08-31 (a 758K download, and also available via Software Update). It improves reliablity on networks with mixed 802.11b (AirPort) and 802.11g (AirPort Extreme) signals. The direct upshot, I'm happy to report, is that it's solved audio dropouts I was hearing when streaming music to an AirPort Express.
At home, I have an AirPort Extreme Base Station connected to my DSL modem. All of my Macs connect via AirPort, so when the AirPort Express was released, I had high hopes that it would be my solution for playing music in the living room. Before the update, I was only able to get solid playback by setting the AirPort Extreme's Mode setting to 802.11b Only. Now, I have it set back to 802.11b/g Compatible and am hearing no audio stutters.