I'd be enthusiastic about nano-satallites, if the space-fairing component of human civilization had established reliable processes for keeping low earth orbit clean and free of orbiting pollution, debris and junk.
The last thing we need is more high-velocity objects being randomly inserted into orbit by hobbyists, when there's no reliable means to clean up the objects left in orbit by predecessors.
http://images.gizmag.com/inline/space-debris-kessler-syndrom...
How about a startup/kickstarter that harvests existing space junk, instead of one that encourages people to haphazardly produce more?