We love TMBG and I confess, I have often played their kiddie CDs even when the kids are not in the car! We got the first one when DS8 was only 2 from my sis. Fabulous and fun! Also love TMBGs adult fare (I'm a fan from w-a-y back). I am thrilled that they are tackling science. It is a fun way to reinforce concepts for the kiddos.

I wanted to recommend another elements game that we received last Fall. It has been mentioned before on this Board but deserves another mention:
Elementeo (a fun, periodic table based Board game)
Game Link

The game was created by a youngster who conceived the notion when he was in 4th grade! Additionally, he was named as one of 2009 Davidson Fellows and received a $25K scholarship. Davidson Fellows

At any rate, my DS8 enjoys this game and it has been a hit at his school as well.