Yeah. I had this same curiosity. I asked a few people about this recently some which are on the jmp committee and the students I've met have been pretty out there intellectually. THey were extremely well rounded and seemed like they were on their way to becoming top notch profs or something of that sort. You take grad classes at cal, which are no joke. I take it that it is harder to get into the jmp in that they require more than the regular program in terms of intellectual well roundedness (if i may) and there is only 12 slots.