"In this tutorial we'll use Photoshop CS to create a shiny new chain. We'll cover creating shapes using a knockout techniques with Shape Layers to applying some fairly sophisticated contours with Layer Styles. This tutorial will help you rethink how Photoshops Layer Styles work and by the end you'll not only have a damn sexy chain, but have learned some new techniques by thinking out of the box on how we assume things should work. Time to get to it!"Jeff Olson
Here is a link to the written version of the tutorial Creating a Shiny Chain with Photoshop - Screencast and the video version is below.