I saw this article and liked the layout of Unity. I would like to have it on my Precise 64bit.
Also I want to keep my current settings, switching back to them whenever I want to.
How can I do that?
Before Unity introduced in Ubuntu 11.04 , Gnome was present in later versions as a default desktop. The article you read was written at April 2011. Ubuntu 11.04 was launched in April 2011 with Unity desktop. Unity is derived from that Netbook desktop and improved a lot after that in Ubuntu 12.04 within a year. The net book desktop was designed earlier than Unity.