In just under two months there will be the release of Ubuntu 9.10 "Karmic Koala", but until then, there is the continual stream of new test releases. The latest test release to emerge from the Canonical camp is Ubuntu 9.10 Alpha 5. This fifth testing release of Mark Shuttleworth's operating system brings the Linux 2.6.31-rc8 kernel, the latest KDE/GNOME packages, a few updated X.Org bits, and many other package updates, although the Karmic Koala is now under a feature freeze.
Also included in Ubuntu 9.10 Alpha 5 is the Ubuntu One file-sharing client and Ubuntu UEC (Enterprise Cloud) images with support for the Amazon EC2 cloud computing service. Besides that, there are the usual spins of Kubuntu, Xubuntu, Ubuntu Server, Ubuntu Netbook Remix, Ubuntu for ARM, and Mythbuntu. The testing page for Ubuntu 9.10 Alpha 5 can be found at Ubuntu.com