just glanced at some of the postings about setting up a community site, so pardon me if you've already discussed this.
why not setup a google code project or use github? both are free, have wikis, and support both ticketing/bug reporting and version control.
it doesn't have to be based on a cms. a resource that integrates with git would be ideal, as that's what i use to version and manage all my other code and writing.
