I just tried out angry birds, and it's 100% faithful to the handheld version, nothing terribly special, but fun all the same. I was going to dock marks for not being able to zoom out, but the mouse scroller (or touchpad) works perfectly for this function.

It doesn't seems as if the implementation is in flash, as it's far too smooth. I fully expect that the implementation is WebGL. I'm very interested to see if more casual games make it over. It's an exciting prospect.

For the record, I am using Ubuntu Linux running Chrome.