I hadn't head of it before now; strange that Solarbotics hasn't announced it here. I don't see any reason that it shouldn't work; solarbotics is pretty familiar with Arduino, having designed their own freeduino board.
Conceptually, I don't know that I like soldering to the AVR package like that. Seems to be the worst of two worlds - all the fragility of a bare DIP and all the permanence of a fully soldered construction. But it certainly is cute!