Check out the North Jersey Jeep Club (
www.northjerseyjeepclub.org). It's a club that caters to all breeds of Jeep, but there are quite a few XJ owners that are members. You can join the forum for free, but if you go the extra mile and join ($40 a year), you can get into the Members Only section of the forum as well as attend monthly trail rides, social events, and as a bonus, you can attend Tech Days, where members help other members repair or upgrade their rigs. I guess it's kind of like here but with Jeeps.
I also happen to be a member. Great group of people. And Justin's also right, the NAXJA site is pretty durned good.