If you don't already know all of the details about Ubuntu 9.10, you aren't reading Phoronix enough with our plethora of coverage. Though some of the highlights for Ubuntu 9.10 include new artwork, GNOME 2.28 integration, many updates to its graphics stack, the Ubuntu Software Center, GRUB2 integration, and much more.
The Ubuntu 9.10 release notes are available and there is also a graphical overview. Download Ubuntu 9.10 and the other members of the Karmic Koala family from Ubuntu.com.
Next up will be Ubuntu 10.04 LTS "Lucid Lynx" next April.