For a great post on how publishers often lose marketing opportunities, read Booksquare on why publishers should blog. It seems fairly obvious, and yet, so many do not. That’s something they don’t make time for and leave to the authors. Perhaps, that’s another reason why there’s so much loading of marketing responsibilities to authors.
Every publisher wants you to pimp your books through your uberplatform. Imagine how much more effective it would be if authors blogged about their work (a given these days) and publishers got their brag on (combined with more marketing savvy?)