The time that I devote to (waste on) the net is mainly spent reading and occasionally posting to newsgroups relating to the games that I enjoy. The majority of the groups that I find worthy of my time and effort are to do with Real Time Strategy games (mainly from Westwood). While most of them receive a fair number of "moronic" posts they also have a hard core of almost intelligent "regulars". Here is a list  of them
together with links to a brief outline of what to expect if you should ever visit them.