Say Hello To My Little Friend

Excuse the state of our window (I think I've mentioned on here before that our seal has broken and there's condensation between the panes that I can't get to to clean, but just in case you're new to my journal!), but look at this little guy! He had absolutely no qualms with me getting up close for this shot and stayed on the sill for a good half hour. Cutie. Anyone know what kind of bird it is?