The Monkey Buddha Archives:
This video from New Scientist shows the firing patterns of the individual brain cells, the neurons:
On BoingBoing, I saw this diagram of various neural cell types:
Finally, this video might not be for the squeamish, but it shows the gross anatomy of an actual brain from a medical donor. The fact that our experience is processed through this soft, wrinkled mass that fits inside our skull is, well... mind-boggling.