Jordi Mallach posted a quick howto about installing GNOME 3 in Debian
The following is a quick HOWTO for the brave Debian users who want to upgrade to GNOME 3. Assuming you have an up to date system running sid, and experimental listed in your APT sources, perform the following complicated steps to end up having a functional GNOME 3 desktopInstalling GNOME 3 in Debian