Sign up for free at LibraryThing!
Once you are signed up click on "Your Books" tab. Add the books you want and then click on "Widget". Customize your widget's header (I wanted mine to show the books I'm reading this summer) size, colors, even icon that shows while it loads (like my flipping book pages), etc. Then copy the html and insert an html widget into your blog.
I love it and so will you!
