IdeaTorrent is what can be defined as an "open innovation software": it let people submit their ideas, brainstorm them, and vote on them. The most popular ideas and requests are then easily assessable.
That's a very interesting mean for a software project to have an insight on the demands of his user base!
IdeaTorrent includes multiples solutions to a single rationale support, strong community based moderation tools, theming support, and is based on Drupal.
http://www.ideatorrent.org/
also:
http://www.spigit.com/
This is quite similar to the way we work on dev.tikiwiki.org
See also:
alias