Here is the link for the Zap Anderson Masterclass: http://area.autodesk.com/masterclasses/class09_mray
It's totally FREE, but you need to make an account on the site to view it, just use a spam email account if you're paranoid about things like that, I've never gotten any email from them though.
Questions/comments? Tweet @BrandonJLa
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In order to render out passes for compositing you need to first isolate your CG elements on a black background with a clean alpha channel, then render out one pass for shadows and one pass for the objects. Follow along the steps that I lay out and try it yourself with the images that I used. You can get them off of my twitter!