While mimicking the OS X dock and stacks isn’t new, it’s certainly not common. Nettuts has shown us a few ways to do “Outside the Box” Navigation with OS X style docks and stacks navigation.
jQuery OS X Stack and Drop Stack is my favorite navigation style out of the three shown in the tutorial. It’s super lightweight (~1kb). It might be a little awkward having the navigation in the bottom right or left of the browser window but it would certainly be creative and save lots of space.
Requirements: jQuery Framework
License: License Free