I found a great attention-grabbing author widget at http://www.freado.com. You upload your cover art and an excerpt from your book and then can add things like links to buy your book, media mentions, and even videos. It then gives you code to embed it in your email signature, blog, Facebook and more. It even keeps stats of how many people have read it. Give it a try!
Great Author Toul: www.freado.com