Well, I saw the ionic breeze mentioned in this thread, and maybe somebody wondering how it was powered.
I believe they use a bunch of piezoelectric fans, which basically flap in the air when electricity is supplied.
Like so.
I read about that in CPU. Eventually, they hope to put them inside CPU dies to cool them off from inside (even though they'll probably make very little airflow, we'll see how it works)
The nano-lightning seems more interesting though.
EDIT: Sorry for hijacking the thread, but I felt compelled to mention that.