Debian is a GNU/Linux operating system. It probably has the longest release cycle of any distro, but counts rock-solid stability as a key feature.
Origin – Home Page: USA – Debian
Desktop: Gnome (default), KDE, LXDE, and XFCE
Price: Free and Open Source
Reviews: You may read a review of the latest Debian release, Debian 5, here.
Download/Buy:: DVD/CD iso images are available for a range of architectures, including x86, ia64, AMD64, PowerPPC, SPARC, etc. Unlike most other Linux distros, Debian provides – for each supported architecture – just one iso image with which you can install a desktop, server (DNS, Mail, Print, and Web), or laptop-optimized operating system. The iso images are available for download from a download mirror nearest to you.
You may also buy a PC with Debian pre-installed from any of the vendors in this list.
Tutorials/Tips: A collection of Debian docs and general help links are available at the Debian support page.
