Has anybody made a list of [Insert Thing Here]s? I'm curious what kind of trade-offs they offer.
http://www.cl.cam.ac.uk/~fms27/papers/2012-BonneauHerOorSta-...
Other publications that might interest you:
http://pico.cl.cam.ac.uk/technical/
Ross Anderson's blog, LightBlueTouchpaper, has writeups on this in authentication category.