Dean Wesley Smith has a neat concept for those doing self-published ebooks--a book card with cover, summary blurb, snippet, and a gift-card like piece with a code for downloading the ebook inside. And it doesn't sound expensive either. He mentioned the idea earlier, but I think this is the first time he actually did it and he posted results too. I find the whole concept innovative and well worth watching to see how it develops.
Jodi
Jodi