Finally found a way to get some photographs without disturbing the birds. Melted a small area of the thick ice on the storm door, then sat just behind a crack in the door and shot pictures through the cleared area -- hence the streaks.
Today's visitors are mostly cardinals and finches. I've long debated whether these are purple finches or house finches. Their bodies are more like house finches, but their beaks are more like purple finches. If there is anyone out there with the definitive answer I'd love to know.
There's also been a few chickadees and tufted tit-mice.