Beginning a project developing a web browser for Mac OS X. Planning on offering a Universal Binary (for PPC and Intel support), 64-bit build, and using WebKit as the layout engine.

Am looking for suggestions on featureset, as well as ideas for improving the JavaScriptCore framework and rendering engine.

The idea here is to provide a very feature rich and light-feeling alternative to the speedy, yet bloaty Safari 5. My only fear is competing with Apple's Nitro JavaScript Engine.