I liked this video. Simple but effective way to do A / B testing on your web site. I wish someone would invent  A / B tests for life. I say W and my life plays out to X : i say Y and my lifes plays out to Z. Alas, i couldnt find anything.

[youtube=http://www.youtube.com/watch?v=1v7m9BFqTJ0&hl=en&fs=1&]

Compliments to http://jasonprance.com/ for this one.