Shiira Project is an interesting web browser for the Mac that is based on WebKit. What makes Shiira special (apart from minor things like a more Cocoa-like layout instead of the tin box shape of Safari) is the ability to display all tabs loaded in a window in an overview of shrunk pages using a hotkey - similar to Exposé. Very stylish, I could also like this function in Safari ...
In addition, Shiia supports cUrl as an alternative to the WebKit downloader - but unfortunately the browser still has some strange properties, for example, the login to WordPress blogs does not always work with it and sometimes old data is displayed. Even with normal authentication it doesn't always work - I then get an error message instead of the browser asking for the password. However, everything looks quite neat with the WebKit downloader.
Since I have a rather small screen (usually set to 1024x768, as the notebook also has this size and I thus have 100 Hz on the display) this will probably not be my standard browser - the sidebar for bookmarks and history is simply impractical on small screens. I would therefore prefer a display of this information in the main page à la Safari or Camino.