The Mozilla Project has released Firefox 2.0.0.9. This release fixes a few regression in 2.0.0.8, or at least it claims to. 2.0.0.8 was stable for me but 2.0.0.9 crashed almost immediately. Your mileage may vary.
The Mozilla Project has released Camino 1.5.3, an open source Mac OS X web browser based on the Gecko 1.8 rendering engine and the Quartz GUI toolkit. It supports pretty much all the technologies that Mozilla does: HTML, XHTML, CSS, XML, XSLT, etc. Mac OS X 10.3 or later is required. Version 1.5.1 adds version 1.8.1.9 of the Mozilla Gecko rendering engine.