i don't know... im just glad i haven't upgraded to 2.0 yet... it seems to be having some problems and the games are way expensive... but i had heard the taptap revenge app was going to be free and it looked way cool!
I upgraded to 2.0 early, and the app store would be a little slow loading sometimes, but it was almost always because i was in the process of another app installing lol also, when i was doing a LOT of using in all the new apps i got my phone restarted on its own a couple times. No harm doen though.
I had the same problem downloading TTR, i would selct install, and it would take me to the home screen to show it was installing, but then say it isn't available, but i finally got it to work after 5 times by quickly going back to the app store before it said anything and when i went back to the home screen it was installed. It is awesome! I like it a lot better than the jailbreak version, except for the fact that you can't use your own songs But it is very cool because you can play 2 player, and the single player involves the accelerometer!