First off, congrats to FireFox/Mozilla for hitting 1.0.

That said, I've been having a brief affair with Camino for the last two weeks. But today (or last night), I decided to go back to Safari. Camino consistently used up 25-50% or more of my CPU, while Safari generally tends to be less of a CPU hog. I also prefer Safari's compact UI, and when doing web dev, Safari's source view generally works better (i.e. shows you the actual source of the page instead of trying to fetch it).