Here is a brake pad and rotor replacement informational article. This one written by Galfer, so it might be a little slanted, but I assume that they know what they are talking about. However, the last half of the article talks about brake discs, how to clean them and how to break-in new pads, which I found interesting. (They recommend not using brake parts cleaner to clean brake discs, as an example.)
http://www.bikebandit.com/blog/post/...-by-galfer-usa