I have been playing the game of go since 2000. Over that time I have advanced to the level of shodan, which, crudely translated, means that in Japan I'm allowed to say I play the game rather than that I'm learning. Over the last year or so I have not been concentrating so much on improving my ability and so have regressed slightly. Hopefully that will change soon.
Apart from playing, I enjoy teaching the game to beginners, especially those based in New Zealand. In the evenings I can often be found on the go server KGS reviewing games. I also run the New Zealand go society website (where this page is hosted).
The game of go is fascinating for many reasons. It is a very Zen game, where your personal qualities and your current mood will significantly affect how you play. It is often quipped that a pro reading the game record of his students can tell when the tea lady entered the room. I doubt there is any other game where you can measure the how greedy, tolerant or flexible someone is just by watching them play.
Computers are famous for how poorly they play go. I have spent a lot of time thinking about how this could be resolved, largely based around extremely careful heuristics for evaluating each position and almost no searching. While I have started writing a go playing program, it has not yet got beyond random moves.