The Ubuntu project has released beta version 8.04 and available for download from the official project web site.
The Ubuntu developers are moving very quickly to bring you the absolute latest and greatest software the open source community has to offer. New feature includes:

+ GNOME 2.22

+ Linux kernel 2.6.24.

+ Firefox 3 beta

+ PulseAudio

+ Vinagre VNC client

+ Brasero CD/DVD burning application

+ There is a new installation option for Windows users. Wubi allows users to install and uninstall Ubuntu like any other Windows application. It does not require a dedicated partition, nor does it affect the existing bootloader, yet users can experience a dual-boot setup almost identical to a full installation.

The final stable version will be released in April 2008. Download cutting edge version from official mirror.