Robots reproduce![1] This would likely be useful, it should eventually lead to robots that can self-repair, and, as it is miniaturized, to specialty robots that build other things. Think Diamond Age. On the other hand, it still tends towards my overall worry that several hundred years from now, we will think that robots evolved. I would like to think there will continue to be a clear distinction between life and its simulation (robots, AI, both). I worry that might cease to be.
[1] http://news.bbc.co.uk/2/hi/science/nature/4538547.stm