I really liked the post on the camera, a picture (no pun intended) is really worth a 1000 words. Even though it was not directly related, I enjoyed reading it. I even showed it to my kids and they seemed to get the gist of it!
The same author has an article on floating point notation, also very well written IMHO.
The bit twiddling page is a gold mine, I book marked it. No frills page with a treasure trove of info! Great find!