Some praise for Site24x7.
I repackaged mongrel_proctitle as a GemPlugin so that all mongrels on use it automatically. This is the first chance I've had to play with GitHub, too. Lovin' it.
Constantly updates the the process title ($0) with something like: "mongrel_rails [10010/2/358]: handling 127.0.0.1: HEAD /feed/calendar/global/91/6de4". Let's you monitor backends with ps and top.