IdeaTorrent is what can be defined as an "open innovation software": it lets 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 project to have an insight on the demands of his user base!
One of the biggest live example is http://brainstorm.ubuntu.com.
The homepage of the project, where you can download the current production code (0.9), is at http://www.ideatorrent.org.
A complete rewrite is under way, since the current production version, 0.9, is almost not using any Drupal services, and thus is not extensible.
Expected release of 2.0 is around the end of 2009.
Current 2.0 branch is stalled and at an early stage. Use rather the current 0.9 version available at http://www.ideatorrent.org . Anyone is welcome to join and take lead in this project.