Joshua Landrum runs games and has a page here . Shaun Derrick is also running a game . John Moser has a very nice site . Someone's nice photo of the game. A very nice map is in the YahooGroups file area.
Some reviews are here and here .
Some people at George Washington University have a list of alternate Pax rules that they apparently use. A British 'zine, The Cunning Plan , runs Pax by Email. You can find contact info here. Mark Boone's improved Administration Sheet . I spent some sick time recently doing Pax stats , which I decided to put on the web as well.