I was watching a Lightroom workshop on CreativeLIVE (also free!) this week and the instructor, Jared Platt, gave a link to his website with a taste of some free presets. (He calls them a snack pack.) All you have to do is put in your name and email and a link will be sent to you. So easy, and so free!
I used the "Cupcake" preset on the pictures below.