Any adventurous mac users out there might be interested that they released a native Mac theme for 3.0 in the nightly build. The theme is a little "more" brushed metal than the actual native apps (to my eyes anyway) it seems, however it still integrates a bit more nicely into the rest of the mac look and feel than the default 3.0b2 theme (not sure I like how they did the tab look though). There's a screenshot linked from the linked post if you're interested.

The nightly build is stable (so far) for me as well... (my first nightly build experiment).