Message Board Solution?

System

Another business unit contacted us asking if there was any way to create a "community message board' on the Intranet. Any easy request w/o worrying about TeamSite, but sadly. We must!

Has anyone had any experience / brainstorms, etc... with a similar issue. The primary concern is archival as we are a financial services firm. A valid solution would have to somehow integrate into TeamSite for archival in editions, and some level of workflow / approval.

Thank you in advance.