From the Xfce website, dated 17 January 2007:
Xfce 4.4 features new tools such as the much awaited Thunar file manager as well as several huge improvements of its core components.
A visual overview of Xfce 4.4 is available here:
Download Xfce 4.4 from the new Xfce website:
Release candidates of Xfce 4.4 have been the default desktop for Xubuntu Edgy Eft (review) and Dapper Drake (review) as well as Vector Linux 5.8 (review). It has been gaining acceptance as an alternative to KDE and Gnome, at least for those who want a lighterweight, less resource intensive Linux/UNIX desktop environment that is still more than a simple window manager.