I just discovered librarything.com. It is fabulous (and free)!
You can put all of your books into it or just some of them and then post the covers on your blog - as you see on mine. I am not quite tricky enough to get rid of the standard headings that they put on the code to copy and paste, but hopefully I will figure it out soon. Even with the headings, I like it much better than my old list - if for no other reason than it automatically pulls up the book covers.