In addition Advogato alows to add your own projects (free software projects) and mark yourself as a person, involved in noted project as Lead developer, Developer or Helper.
It is built on mod_virgule (virgule) engine. This software was redeveloped by lkcl to be XML enhanced (mod_xvl on virgule.sourceforge.net).
And pay attention to advogato trust metric. It is really cool method of geting rid of SPAM and bad posts. It is something, which is implemented in E2 as levels. But it is based on members desision (via use of certificate) not on certain algorithm, as here). Also it have seeds persons, with are the root persons and their certs most valuable ;-)