Look under the right rear seat. On the little plastic thingy that holds the jack and tire iron they're instructions as to the proper jack points and jacking procedure.
You were right, btw, you could do serious damage my jacking the jeep up from just any old place.
This being said they're are plenty of sutable place other than the ones in the manual. But you'll always know you're safe if you stick to the manual.
Happy jacking.... sorry couldn't resist
2002 KJ - K&N, Kenwood KDC-252u, Pioneer 760w, (2) Kicker Comp VR 12's
"When you have a Jeep, you must do Jeep things."