That is a very nice picture, Kestrel. For a moment I thought it was the same bird as this:
[qimg]http://www.internationalskeptics.com/forums/imagehosting/thum_56649e8163c27ac0.jpg[/qimg]
So far I haven't been able to figure out what this is. I saw it at the park today. The same bird was in my backyard and I took a picture of it through the dirty window of my office.
I suspect it is a common bird but that hasn't helped me figure out what it is. I've looked at most of the likely suspects in the list of 130 birds for my local park. Gnatcatchers gave me a glimmer of hope, after that some of the fly catchers looked plausible. Some kind of vireo seemed believable.
The picture doesn't show the beak very well. On the picture I took of the bird at the park the beak seems stout, a little crow like.
ETA:
I might have stumbled on the answer?
Maybe this is more likely?