Looking for other Grand Cherokee message boards or forums that are more active than this one.

All tech levels - heavy traffic
http://www.jeepsunlimited.com/forums/forumdisplay.php?f=180
More advanced - moderate traffic
http://www.nagca.com/forum/
You'd better know your stuff before posting or it will get ugly
http://mallcrawlin.com/
Nice reference for newer (WJ) Jeeps
http://www.wjjeeps.com/expindex.htm

Some more....
http://www.jeepforums.com/
http://www.jeephorizons.com/