Most people seem to think this is a fold, but I'm not so sure. If you're going to fold JJ here, then what about QQ? I doubt too many people are going to be stupid enough to limp in with QQ or even AQ, so really you should be folding QQ in this position too because you fear the same 2 or 3 hands. I also think that the all in raise instead of just a large raise suggests that the person doesnt have Aces, but rather a mid pocket pair. If the player had raised to 600 or so, that would have been a much scarier call.
http://forumserver.twoplustwo.com/sh...14&fpart=1