I think all of Firefox's new features are really good, but I don't understand why it took them so long to do it. Though, I'm sure it'll be worth the wait.
I personally think to use it now is stupid, because 2 extensions cover the bases of all of the features included in the 2.0 BETA.
Michael: Jodie, how's my schedule look for today? Jodie: You've got a conference and dinner party at the Japanese Embassy regarding wildlife protection. Michael: Oh, yeah...sorry, but I'll have to cancel that. I'm heading out to save America!