In March, the SharePoint team announced a forthcoming integration between SharePoint 2007 and Telligent Community Server 2008.  The Community Server SharePoint integration should be available sometime later this month! 

See www.telligent.com for more info on Telligent Community Server and review this blog entry at http://blogs.msdn.com/sharepoint/archive/2008/03/29/announcing-the-integration-between-telligent-community-server-2008-and-microsoft-office-sharepoint-server-2007.aspx