One could use Yahoo Messenger http://messenger.yahoo.com/ Once Yahoo Messenger is set up with your user name there are rooms available to use. Click on 'Messager' at the top of the Yahoo Interface box, then scroll down to 'Yahoo Chat' then 'Join A Room' you could select under 'Clutures & Community' then highlight 'Groups' one on the list is 'Transgendered'. One would have to let the PFM members what room your in and what time you will be there.
Seems most of the Live Chat rooms except for a few are empty. Susans Room http://www.susans.org/chat/ #Chat seems to be the most active for TG's and crossdressers. So again if there were a live chat room just for PFM created one would need to let the other members what time with the time zone listed you are going to be there. Otherwise the Chat Room will be empty. The difficult part is deciding what would be a good time for the Chat Room to be active to have the most members on at the same time!