According to Asa, this Wednesday might be "ship day" for the first Firefox 1.5 release candidate. Once it's released, I think I'm going to replace 1.0.7 with RC1 as my primary browser. The beta releases weren't nearly as stable as I wish they had been (I unsuccessfully tried switching to them shortly after their release), but the latest nightly builds have seemed very stable. All of the new features and bug fixes in 1.5 make it awfully hard to pass up.