Mozilla
have developed the simple free webapp, asknot [1]. The idea is that the
user is asked if he/she is interested in contributing in a particular
area, the user can then either ask for more details or reject the idea
and get another suggestion [2].
By asking the user upfront about areas of interest it complements the traditional approach to inform potential contributors to contributions opportunities .
I
think this something that the Debian could implement. Beside a
domain what is needed is a design (and custom urls of course). I would
be glad to volunteer to work on the content/urls.