Forget about the first Viva Pinata, just get the second one. It's pretty much the same game with more stuff. Bayonetta is a good pick too. And yes, Crackdown. It's better if you have a friend to play with. I once played co-op for about 10-12 hours straight. But you can have fun with it alone too. Oh and you can't install Crackdown to hard drive. I don't know why this is, but it sucks.
I watched the finale recently too and I fucking loved it. I don't remember the last time I cried like that. What a great show. I highly recommend it to everyone. And Michael C. Hall is awesome in it. After watching Dexter and this show he has become one of my favorite actors.