http://siliconretina.ini.uzh.ch/wiki/index.php
I just learned about Dynamic Video Sensors and they look impressive! I wonder if the pixy can be used as a DVS. There is a high-end, pricey model one can buy but also an embedded version that kinda has the specs of the pixy (https://wiki.lsr.ei.tum.de/nst/programming/edvsgettingstarted.)
Still not impressed? Check out the potential when attached to a quadcopter: http://youtu.be/LauQ6LWTkxM