The Mozilla Wiki has some Firefox/3.7 Windows Theme Mockups for consumption. Nothing mindblowing, but a good step more towards the uber-cool windows (for one) look integration that was promised for the 3.0 phase (or was it earlier?). I find it interesting that they're moving towards the Chrome/Safari style with the page and tool buttons on the right hand side of the bookmarks bar, but after using chrome for a bit, it does seem a reasonable design paradigm. Very sexy buttons too!