Oh, and to the OP. Seeing as Camino is totally free, it wouldn't hurt to just download it and give it a whirl yourself to see if you'd like it now. I'm using the latest stable version of Camino but a ton of people here on MR say the nightly builds are quite stable (and those are the versions with spellchecker built in).
I like Camino as my backup browser for those times when Safari's JavaScript just isn't up to snuff. Beyond that, I use Safari (with Inquisitor plugin) for my day-to-day.
I do, however, prefer Camino to Firefox on the Mac.