Xubuntu 12.04 alpha 2 amd64 CD takes full advantage of computers based on the AMD64 or EM64T architecture (e.g., Athlon64, Opteron, EM64T Xeon, Core 2). If you have a non-64-bit processor made by AMD, or if you need full support for 32-bit code, use the Intel x86 images instead. Its main features are as follows: New greeter + theme xfdesktop4 has been updated to support single click to open items, thumbnail support for the desktop. xfce4-settings has been updated to include the new mouche/touchpad dialog (backported from 4.9.x) Some other syncs, updates and patches from Debian and upstream, including: xfce4-power-manager, Ristretto and gmusicbrowser, Minor updates to default settings and packages, mostly appearance (including Terminal font size change) etc....
About Xubuntu
Xubuntu is a Linux distribution based on Ubuntu. Unlike its parent, however, Xubuntu uses the light-weight Xfce desktop environment and is optimised for lower-end machines. The distribution includes only GTK+ applications where possible.