elementary

Marlin is Elementary's file browser focused both on eyecandy and functionality, designed probably as a notorious Nautilus Elementary step forward.

We announced Marlin months ago and, while in Ubuntu 11.04 didn't quite fit, is properly designed and built for Ubuntu 11.10 (Marlin is fully GTK+3).

The look is simple yet properly organized in three main areas (when in fullscreen mode):

The notorious GTK theme, Elementary, has just been updated to 2.1 version after 5 month from previous 2.0 version.

Elementary theme creator, Dan Rabbit, has dropped the Aurora engine in this release and added an xfwm4 theme.
The great thing about Elementary GTK 2.1 is its compatibility with GTK 3 (shipped by default in Natty Narwhal +1, parts of it shipped already in Natty).

For installation, just add the following PPA (Maverick Meerkat only):

Victory, a nice GTK 2.x theme, has been updated, bringing some new features like a Victory icon set (if you want to use it, download it from here), nice integration with Chrome/ium, Banshee, Shotwell and a few small fixes.