Project Management Software

We will begin a revision of our math course of study soon and I'm looking for a "space" where our teachers can work collaboratively, 24/7. I'm playing around with the newest version of pbwiki because it has folder capabilities. (This will encompass grades K-12.) It also has a calendar feature (nice), as well as a chat plugin. I know wikis allow for comments but I'd really like to see more of a forum type solution so participants can have conversations around best practices, resources and just sharing of ideas. Our district has Moodle but I don't care for the wiki on Moodle. I've thought about creating a Ning site and linking it with the wiki but currently any Ning site is blocked in our district. Any ideas or thoughts would be greatly appreciated!