After upgrading to OS X 10.5, I just discovered that AirPort Utility (or at least my AirPort Utility) will no longer manage my original Airport Base Station, circa 1999. This puppy has survived many Macs and PCs passing through the house. It even has had a capacitor replacement, proving that I remember the soldering iron skills that my father and Heathkit gave me more than 40 years ago. If you want an old Airport base station for a museum (or want four spare replacement capacitors!), let me know.
In its place is a two-year-old Linksys WRT54G that I bought for the purpose of playing with the firmware. Last night, I downloaded and installed Tomato version 1.14. It was completely trivial and has proven to be quite useful. The signal from the base station (which is in the garage) is much stronger, I can do better UPnP debugging, and the bandwidth usage graphs are, well, useless and pretty.