ElementaryOS 0.2 Luna is a linux distro that has become quite popular recently. It is based on Ubuntu and designed to look somewhat like a mac. There have been many attempts to get a mac like feel on the linux desktop and Pear OS is the most significant one. However all of them fall short somewhere or the other.
Elementary introduces a new desktop environment called Pantheon that achieves a lot. First of all it gives a mac like look and feel, but most importantly it makes the desktop remarkably simple and productive. I think I shall use it on notebook and those desktops where I don't code.
I have been using KDE for the last decade and never moved out of it. Never liked gnome, never needed xfce or any of those light desktops. But elementary seems something irresistible. Not only are the looks elegant and beautiful, the usability is remarkable compared to other more common desktop environments like Gnome or Unity. Elementary has the perfect balance of style and usability and this would no doubt make it a very popular distro.