While we haven't had time to test all of them, but off the bat we're getting mixed results with AirPlay Mirroring of iPad 2 TV and movie apps. CityTV wouldn't work -- it cited contractual obligations. CTV did work and so did Global. Crackle was buggy. We're trying more now.
Some TV and movie apps use Apple's built in media controls so AirPlay works automagically. Others... have opted out. We were kind of hoping AirPlay Mirroring would let us work around it. Maybe it will. Or maybe Hollywood will update to shut it out of more apps. We shall see.
Have you tried out your favorite iPad 2 TV or movie app on Apple TV yet? Did it work?