(If posting links like this is considered spam, please let me know, or feel free to take it down.)

I've come across a website that's really changed my perspective on zazen, and practice in general.
It is written by a fourth year medical student who highly values meditation, and has attempted to explain the unexplainable reality that is the brain to us mere mortals.

Go ahead and have a look, if this sounds interesting to you!

http://www.mindfulnessmd.com/