Starting from this post, Gary Brown and others have related on the XP mailing list how multiple XP teams may work sharing the same open workspace.

Each team has a 4' x 6' rolling white board on one side with cork board on the other side, plus we have a couple of spares when needed. Some of the teams use XPlanner, some use Excel, some use cards, most use multiple methods to maintain stories. Most of our charts and graphs are on the intranet, so our remote customers can see them.