Simple statistics alghoritm that beats A/B methodology hands down

http://stevehanov.ca/blog/index.php?id=132

The alghoritm shows [Buy me!] button in 3 different colors. If user clicks it, "click through ration" for color is risen. It user does not, it's lowered. After 100 clicks (and thousands of visits) one gets very good estimate of both click througrh ratio and which button works best.

Simple.

The Top 10 Ways to get screwed by the "C" programming language

http://www.andromeda.com/people/ddyer/topten.html

My favorite is 16. Octal numbers.
This made it to Javascript even. So obviously stupid, yet survives..