@ daeVArt - I haven't used PS and so did not do a conversion guide for PS for this tut. However, Korash is right, most of the techniques discussed in this tutorial are also available in PS (in fact the gradient map is actually better in PS since PS offers a preview window that allows you to visually adjust the colors before applying them. The only thing that might be different are the sort of cloud patterns used for the height map. I'm not sure if PS will generate similar cloud patterns or not. If you do try it out in PS I'd be curious to see how similar the result ends up being.

Cheers,
-Arsheesh