Jeremy - I believe that is a Downy Woodpecker. Very nice shot. They look almost the same as the Hairy, but are smaller. One way to tell them apart (besides size) is the beak. The Hairy's beak is longer than the head is wide, while the Downy's beak is shorter in length than the head is wide.
I remember that Harry and Downey woodpeckers used to visit my grandmother's feeder when I was a kid. I recognized this fellow as one of them, but I couldn't remember which was which. Thanks for the help and comments.