This isn’t really Web 2.0 or social media or anything like that (depending on your definition, of course) but for some reason I just love this story from GigaOm’s James Wagner Au about the rise of Desktop Tower Defense. Paul Preece’s Flash mini-game has exploded in a truly viral way, to the point where he is getting 20 million page views a month. That could translate into six figures in revenue, and the hosting costs are minimal. Isn’t the Web great?