Show me the code
As promised, mod_virgule (the code to drive Advogato) is now released under GPL, and is available in Gnome CVS. Feel free to play with it, although it's probably a good idea to coordinate with me before making nontrivial changes, as there are some core changes I have in mind.
You'll need recent versions of glib and gnome-xml to build and install mod_virgule.
Most important, have fun!