Chimera is now available in the new 0.6.0 version. A very nice and fast browser based on Mozilla but with a Cocoa interface. Every Mac OS X user should take a look at it. Especially with large forms (e.g. the news list in Radio Userland), it handles things significantly faster than other browsers. However, the text edit field is a bit slow; the cursor lags a bit during input. Strange, but they'll probably get that under control too.
Found at VersionTracker.com - Mac OS X.