Here's a "must watch" documentary series, I already mentioned it on a previous post, but I thought it deserved a post on its own. For those of you not familiar with Google Video, you can watch online but I'd recommend viewing it with Google player available on the links, and download the movies manually. Besides it's rather long so you'll probably want to watch them on your free time.
Thank you chelhman, I only get the chance to see the first part, and i really find it interesting, I will comment I guess when i finish the last two parts. Peace,