Now available for free download is The Making of Star Wars: Revenge of the Sith -- The Final Chapter
by J.W. Rinzler, published by Del Rey Books.
This eBook is literally the epilogue of the physical publication, The Making of Star Wars: Revenge of the Sith
by J.W. Rinzler. Publishing lead-times meant that some of the late-breaking developments of the production of Episode III couldn't make their way into the physical book, making the eBook format perfect for the The Final Chapter
for download (2.3MB, PDF).
Of course as a Star Wars fan, you should buy the full book. Amazon has it currently on sale