I don't think I've seen this link anywhere on the forum, or maybe I just missed it, but this is such an amazing resource! It has tons of pictures for each day of an eggs development including videos! http://www.minkhollow.ca/HatchingProgram/Candling/index.html
Pretty sure minkhollow is up in the "Read me on Hatching" thread, along with manyother useful ones. I do love the photos though. I just wish she'd had time to complete the series already. It is a good site.