I've been giving a lot of thought to starting a Sourceforge project for my logic programming work. I generally view AI::Prolog as a prototype for AI::Logic. I see parallel projects where the former is a pure Perl implementation for prototyping and testing and the latter is written in Inline::C or XS with the same interface but reasonable performance. However, there are problems with this approach.
First, I'd like help. Collaborating via personal email doesn't work very well for me. Second, others have expressed an interest in helping or learning, but handling this one person at a time is not very effective. I think having a mailing list would help and having a project where people could always check out the latest sources could also be useful. Very few Perl programmers really appreciate the power available here, so I think a coordinated effort to "spread the news" might help.
I'm used to leading stuff like this is a business setting, but in an open-source environment I'm used to working alone or submitting patches. This is a rather new thought to me.