Fast, indeed. The only site that's still dog slow in it is maemo.org :-)

I like the resizable textareas. And of course all Google stuff is like on steroids (Gmail, Calendar, Apps etc.). It's going to shine as an AJAX engine.

I won't be switching until there's a decent plugin system with some basic stuff available, like an Adblock equivalent. I'm still waiting for some stuff to updated for FF3 anyway :-)