Gerald, you're awesome. Thanks so much for sharing this with us! I signed up over the weekend, and implementation looks great so far. Very easy to sign up. Unfortunately, I'm one of the poor Wordpress.com people. As soon as you have that banner ready, I'll get it up on my site. I definitely want to do my part.
ETA: I was wondering, since the book cover/info pulls from the ASIN, is it true that when I update my book covers, the covers will change in the banner too? Or will I need to re-add my books to get the new covers displayed?