If you want to get new contributors to a project, try following the ideas behind the Fedora Design Bounties.
There is a video about them here: http://www.youtube.com/watch?v=DjvqWKsndGs
The important parts are:
- Offer a specific thing that you want a new contributor to do
- Offer guidance and mentorship
- Make the prize for doing it be inclusion in the community.
You can ask Asheesh for more information!