I just found out about this today and wanted to pass this on to other authors as a promotional tool.  For embedding the Smashword slideshow below into your website and/or blog, Smashwords will put your name and website and/or blog on their list of participants.  It’s an easy way to get word spread about you which, in turn, might lead someone to your books. 

After you embed the slideshow into your blog and/or website, send the links to the comments/questions link on the Smashwords home page.   This link is at the very top of the page.  Click on it and it’ll pop up. 

Here is Mark Coker’s blog post so you can read the details and see the list for yourself. 

Below is the slideshow you’ll embed: