Are Nanoblocks compatible with other building bricks?
It appears that the goal of the nanoblock producers is to make "the world’s smallest toy building blocks"1.  And they appear to be too small to be compatible with LEGO.  See the following video comparisons of the sizes.

http://www.youtube.com/watch?v=4Cobnr8fWTY

http://www.youtube.com/watch?v=9QXGP837-dU

1. http://www.mynanoblock.com/site/?page_id=2