Camino is, in essence, FireFox with a native Mac interface. It's worth noting that Camino was the inspiration for FireFox, but while Camino's interface is great, it's lack of plugin support makes the advantage of native Mac "look and feel" not really worth it for serious users.
Camino
Web Browser
Free
Very Easy to Use
Powerful
Stable
Open Source
Standards Compliant
Mac | Windows | Linux