I love the friendship between these two. I think it's one of the better developed ones in this show. I especially loved it in the end of the Penelope episode when Garcia said that she didn't want JJ to have to do that and JJ said somethng to the effect of "You're family, I didn't hesitate". If I was at my own computer then I'd be able to get the exact quote, but I'm out of town right now so I'm stuck with what I got.