Apple has released a 2007-001 update for the AirPort Base Station for Mac which "includes general fixes and compatibility updates for the following applications":
AirPort Admin Utility for Graphite and Snow Base Stations
AirPort Disk Utility
AirPort Disk Agent
While Apple's Support Doc says the update covers a range of AirPort Base Station software, MacUser is reporting that this one apparently only updates the latest 802.11n version (AirPort Utility 5.1, to be exact). Either way, I'm about to install it for my 802.11n-enabled station now, and I'm keeping as many fingers crossed as possible that AirPort Disk begins to actually work.
[Update: Apple's support doc is titled "AirPort Base Station Update 2007-001 for Mac" (hence my own post's clever title), and I tried specifying that this only updates software in the post, what with the bulleted list that contains nothing but software and the lack of the term 'firmware' anywhere, but to clarify: despite the mention of "AirPort Admin Utility for Graphite and Snow Base Stations" in Apple's announcement, this update allegedly only affects current software/utilities (the stuff that gets installed on your Mac) for the latest 802.11n Base Station.]