According to the owner of the site, Kindle integration will be a top priority

"2. Our members have been asking us to bring the Goodreads experience to an e-reader for a long time. Now we're looking forward to bringing Goodreads to the most popular e-reader in the world, Kindle, and further reinventing what reading can be."

http://www.goodreads.com/blog/show/413-exciting-news-about-g...