I had a (possibly) brilliant marketing idea. Instead of the traditional bookmarks or postcards that authors create to market their books, how about author trading cards? Or book trading cards? Or character trading cards?
The character trading cards could reveal little things about a character that were part of world building, but never show up in the book. (Downside, argh! The character art!)
Book trading cards could use the cover art from the book.
Author trading cards could list the biography of the author, as well as publication history. This would (hopefully) change over time, so your first publication would be your "rookie" card. They could either use a picture of the author, or (for the camera shy) cover art from the latest book.