Compositing depth pass with After Effects

Here's another link for creating DOF with a depth pass in After Effects,I keep getting this question a lot but never got the time to write a tutorial on this.Hope this helps Cheers!

http://www.bernardlebel.com/tutorials/AFX_depthPassDof/DOF.htm

RGB light Passes

Here's a link on creating and compositing RGB light passes,These passes can be used to change light colors as well as intensities without re-rendering the images.

http://williework.blogspot.com/2008/12/technical-rgb-light-passes.html