Well, we've reached a neat milestone in A.J.'s development...the last day or so, he's enjoyed rolling over, pretty much constantly. I put him down this afternoon (well, Friday afternoon) on his playmat, and instead of playing with the toys, he'd roll to his right and onto his belly, and then roll back onto his back. Then he'd roll left onto his belly and vice versa. He wasn't laughing or smiling or anything, just looking around and getting the hang of it. I guess he started doing that Thursday...now it appears to be fun to him.
I'll try to get some video of it and post it in the next day or so...