When I was in Camp Verde, Arizona (April 28-May 4), I saw this wonderful bird, which looked so much like an eastern phoebe (we see them during migration in Central Park). I checked a number of books, and I believe these birds, so very fun to watch, are Say's phoebes. They certainly look like flycatchers, at any rate. I'm posting as Say's phoebes, and will edit the post and the page if I find out otherwise.
Please feel free to comment or send me an email at Susan@pmsaga.com or Susan.Kirby@gmail.com.
Visit the Say's Phoebes page to see more photos of this wonderful bird.