RC3 is sexy. I'm running it at work and at home now. There are a couple of things I'd like to see introduced (like dragging bookmarks into their folders from the URL bar), but all in all, it's pretty tight. It's working very well.
Here's a fun bug for you Windows users: Launch Mozilla, minimize it, launch it again. Now, try to type a URL in the location bar.
That's supposed to be fixed soon, though. And I don't have to deal with it on Linux.
Anyway, it looks like we're finally getting close. Mozilla is becoming a real browser now. I'm happy.