I’m playing with the beta.
It seems a little snappier that 2, but that’s difficult to see. I’ve also had trouble with 2 hogging memory, which 3 hasn’t done yet. But then, give it time…
I notice, whilst writing this, that the WordPress buttons all look flatter, now, like they do in Firefox. Hang on – no, neither Googlemail’s GoogleTalk in-browser client nor the Custom Admin Menu WordPress plugin work with 3.
One really cool thing: try hitting cmd-F and searching for something.