Apparently (I can't confirm this yet) it's DLC for racing games that I never ever want to play.
Forza, Need For Chavs, the usual cack.
It's like Microsoft are deliberately shunning money. I've got 8000+M$P to spend and I bought loads of stuff in those decent deals from a couple of months back but we get three DLC deals in a row and two weeks of no XBLA games. During E3 week no less.
Seriously, I know it's PC gaming and that's kind of horrible but you should check out Steam. It's like INFINITELY BETTER.