http://www.authorgraph.com allows readers who purchase e-books to request autographs from the authors. Authorgraph has a widget to add to WordPress sites.
For authors (of books, blogs, articles, etc. If it can be downloaded to a Kindle or Nook...), this is a promotional tool and a way to connect with one's audience. I'd like to add it to my blog.
The blog I need help with is susanthatcher.wordpress.com.