Ubuntu 11.04, codename Natty Narwhal, released on 28th April 2011 is the first Ubuntu Version which is powered by the new Unity desktop for the Desktop version as well. The UI is pretty awesome, there are a few similarities to the Mac OS X Desktop, e.g. the combined Application bar and Title bar of the applications. That looks great and it saves some space, especially on small screens.
However, I am experiencing frequent crashes from the X server. This is pretty uncool when you’re working on an live event and the screen gets black. It may be an bug from Unity, but it may also be an bug in the X server itself. The Ubuntu project is willing to change to the Wayland X server to replace the X.Org one, which is expected to be more lightweight.