Just pick an example on the left and then insert the code on the right into your site. Done!
The styling is up to you. The styles used on this page can be seen on the right of this box. Soon, you will be able to control which quotes show up, but this is not ready yet. For now, there is the RSS API.
By the way, if you can figure out why this page looks like crap in IE, please write. I'm too busy to deal with it right now. It's still functional, but is laid out wrong. I will plug your site in gratitude.