After more than two years of development, Xfce 4.4.0 has just been released. Xfce 4.4 features new tools such as the much awaited Thunar file manager as well as several huge improvements of its core components.
There is a lot new in 4.4, most notably the freshly baked Thunar file manager which finally replaces Xffm. Thunar is not the only new addition or update though, so be sure to check out the guided tour and see if it’s an environment you want to try. For current Xfce users, it looks like you will be pleased with your upgrade.
Source: Xfce 4.4 Tour