Macbuntu is a nice little script that can completely transform your Ubuntu and make it look like Mac OSX. There were other projects like Mac4Lin with similar goals before, but Macbuntu is way better performer in mimicking Mac OSX look and feel.

Macbuntu - Brilliant Transformation of Ubuntu into Mac OSX
Macbuntu does the job. Even the minutest details of a Mac is installed with much finesse. If you like playing around with the look and feel of your Ubuntu, Macbuntu is one script you definitely should try out. Though I have never really used a Mac before, I really liked Macbuntu and the way it transformed my desktop.