Chrome tab performance may be weak due to a slow router. I bought a newer Asus and it helped quite a lot. I can play youtube videos within a Chrome tab and it works perfectly well, even with the router several bedrooms away.

That's the reason to be excited about the SDK release, but honestly, regardless of the number of apps even available, I just don't use that many services that I want to stream to my TV. The current crop does pretty well. I would like to see the ability to throw a Flash object to the screen so I can play any embedded video, and I hope to see interesting games and ambient apps, but that's about the extent I can think of.

legally and in high quality? not really. I wouldn't throw a superbowl party without tv access, but if you want to watch your favorite team when you otherwise can't, its definitely possible.