Ubuntu is a Linux distribution for your desktop or server, with a fast and easy install, regular releases, a tight selection of excellent packages installed by default. The latest version Ubuntu 5.10 Breezy Badger has been released (Ubuntu does keep up with its promise of 6 month release cycle.
Whats new in 5.10 is that it has been ported to three new architectures – HP PA-RISC, Intel IA64 and SPARC. The other major features are Thin Client Integration, OEM Installer support, LaunchPad Integration. See the list of other features available.