You aren't really supposed to know what CMAP means, I'm just playing on those annoying little etext acronyms we all use. CMAP means Common Misconceptions About Publishing, which is the title of a very good series of blog posts by a published author named Charles Stross. He now has nine posts, the most recent of which is about e-books, and I highly reccomend that authors and those who want to be authors read every one. They are full of level-headed facts about the publishing industry that you really should know.
CMAP #1 is here.