Lxde

The “Lightweight X11 Desktop Environment” is an extremely fast-performing and energy-saving desktop environment.

Maintained by an international community of developers, it comes with a beautiful interface, multi-language support, standard keyboard short cuts and additional features like tabbed file browsing. LXDE uses less CPU and less RAM than other environments.

Installed applications

Cheese
Chromium
Gimp
Mplayer
Libreoffice
Medit
Pidgin
Pragha
Pcmanfm
Skype
Thunderbird
Transmission
Simple burn

Installations and more information is available here: http://www.foresightlinux.se/wiki-en/index.php?title=Lxde