I haven't had any problems with it for the 24 hours I've been using it. I've been using the trunk builds forever now, so the Alpha is no big difference I think. Test away, and file tickets when you do run into issues 🙂
There's always development going. They have a lot of cool new features that coming soon. If you've played with tabs in Adium, they're almost ready to bring the same to Camino- they've spent the whole summer getting the new tab system ready for 1.2 or 1.3.
If you're interested in trying out the latest and greatest, I'd suggest backing up your profile (just in case), and then downloading a development version of 1.2. You can even get souped up (optimized for your specific chip) versions of 1.2 for whichever processor you have.