www.jeepsunlimited.com - Don't expect too much from it, though. Mostly good for finding answers to "how big of tires can I run with 'xxx' of lift?" or "What replacement bulbs have the most purple/blue tint?".
I cruise the for sale section once in a while...they will sometimes have a good deal on certain things...most of the time though its overpriced...the site will drive you crazy at how gay it is...
The TJ and ZJ boards are whacked.........the XJ board isn't bad, but consider your sources before taking advice. There's some old timers on the XJ board that try to keep the riffraf out a little.