Along with the Mac OS X 10.5.4 update tonight, Apple also released firmware 7.3.2 for Time Capsules and AirPort Base Stations. Apple states that it "includes general fixes and compatibility updates" for both Time Capsule and AirPorts with 802.11n.
Most likely your AirPort (or Time Capsule) will find and download the update automatically; however, you can also visit the Apple Support Downloads page to download the installer package for Leopard, Tiger, or Windows.
Thanks to everyone who sent this in!
Time Capsule and AirPort Base Station (802.11n) Firmware 7.3.2
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