Learn to play go on line

Go, is one of the oldest board games in the world (ok I just made that up - but it's pretty old... right?)

From Wikipedia...

Go is played by alternately placing black and white stones on the vacant intersections of a 19×19 rectilinear grid. A stone is captured and removed if it is tightly surrounded by stones of the opposing color. The objective is to control a larger territory than the opponent by placing one's stones so they cannot be captured, but can capture any opposing stones played in one's territory. The game ends and the score is counted when both players consecutively pass on a turn, indicating that neither side can increase its territory or reduce its opponent's; the game can also end by resignation.

It's one of those games that is really easy to learn, and incredibly difficult to master. I've always been intrigued by how it all works, and have recently found a cool interactive tutorial that explains how to play Go. Worth checking out I think.