Jeff Vadermeer's Wonderbook is an illustrated guidebook on writing. While aimed primarily at fantasy writers, I'd applicable to all genres. It provides a wealth of helpful information, plus a really interesting companion website.
One of the items on the website is the Editor Roundtable. The page has a short story submission--one that was rejected--and comments and critique from a number of editors. The intent is to show writers a behind the scene glimpse of the editors' thought process and preferences of different editors.
When Lynne Hinkley, Author and Marine Scientist, recommended it to members of Internet Writing Workshop. She said, "I found it quite fascinating and thought many of you would too."