There are download links for the *buntu 9.04 releases within the Canonical release announcement. Ubuntu 9.04 features EXT4 installation support, a new notification system, GNOME 2.26, a slightly updated kernel, and many other changes. More details on this new release by Mark Shuttleworth's company can be found in a Ubuntu 9.04 search.
Michael Larabel is the principal author of Phoronix.com and founded the web-site in 2004 with a focus on enriching the Linux hardware experience and being the largest web-site devoted to Linux hardware reviews, particularly for products relevant to Linux gamers and enthusiasts but also commonly reviewing servers/workstations and embedded Linux devices. Michael has written more than 10,000 articles covering the state of Linux hardware support, Linux performance, graphics hardware drivers, and other topics. Michael is also the lead developer of the Phoronix Test Suite, Phoromatic, and OpenBenchmarking.org automated testing software. He can be followed via Twitter or contacted via MichaelLarabel.com.