Howtoforge posted a guide about making Ubuntu Linux look like Mac OS X

We've already shown you how to customize your Ubuntu installation and make it look like Windows 7, and now we're back to show you how to turn Linux into a Mac OS X lookalike in just a couple of minutes.
To accomplish this, we're going to use Macbuntu, an open-source program designed to transform the Linux theme into a Mac OS X environment. Although Macbuntu is dedicated to Ubuntu Linux OS, it could be used in other OS based on Debian/GTK.How To Use Clipping Masks (And Not Layer Masks) in PhotoshopHow to Remotely Control Your PC (Even When it Crashes)Use Windows 7’s Previous Versions to Go Back in Time and Save Your Files

  How to Make Ubuntu Linux Look Like Mac OS X