http://forums.debian.net/viewtopic.php?f=6&t=75463. The Gnome 3.2 desktop is available in the Debian Testing repository. This means that any Debian user who wishes to install and test out this new desktop may do so by switching to the testing repositories and installing the required packages. This forum post has some information on how to install the Gnome 3 …

Gnome 3 has just made it into Debian experimental with version 3.0 packages available, but once you have installed this you will have great problems getting back to Gnome 2.32, so it is not recommended to install this until the packages are perfected and the panel applets such as the Weather and CPU speed applets …