Out of curiosity I compiled Kazehakase with WebKit support.
It works like a charm, with very good page rendering, as expected from the Webkit engine. Some functionality is still missing, nothing unexpected from beta software though.
It gets 90/100 @ http://acid3.acidtests.org/
To try it, checkout the latest WebKit SVN, install XULRunner, and compile kazehakase from scratch.
After this, fire up the browser, go to the preferences, "browser" section and select webkit_gtk from the drop-down menu. Happy lightweight browsing.
Ubuntu Forums is one the sites that isn't rendered right, dunno why - it's one of the few around (I've found very few indeed). Oh and don't expect Java, flash or anyother candy