Ubuntu 11.10, codenamed Oneiric Ocelot, prowled out of the development forest earlier this month. In our review of Ubuntu 11.04, released back in April, we took a close look at the strengths and weaknesses of the new Unity shell and compared it with GNOME 3.0. In this review, we're going to revisit Unity to see how much progress it has made over the past six months. We will also take a close look at the updated Software Center user interface and the transition from Evolution to Thunderbird.