So soon? No, I don't think so. They've never left. (See the posts titled "Hello?" and "Today was the day," below.)
I had thought that the little guys had completely abandoned their nest, but apparently they have been coming back at the same time every evening for a little reunion. They don't go into the nest, but cluster together for a few minutes on the roof over it. Then they are off again.
This is a pretty bad picture justified only by "newsworthy" content. It was taken through the glass of my kitchen window. When I pushed the shutter button there were five of the hyperactive little buggers. As you can see only three stuck around to be posterity-ized. They are really neat little birds and I like having them around.