Did you notice I have added the " You might also like" to underneath my posts? I had been looking at all my favorite blogs wondering how to do it.. And then it hit me. Literally. If you look closely there's a small link, that you can click to get you to here. You don't even have to sign up for it, it just adds the widget to your blog dashboard.
Go on over to this site, and it practically does it for you! Just add your info and your done!