I've got to admit that I am mainly here to procrastinate, I guess. Other useful things with a forum like this is that you get to learn a bunch of things, as well as teach/help others. One positive thing with helping others is that you're refreshing/updating your own skills.
Another great thing is that I get to practice my English. Students in Sweden usually read a lot of English literature. We watch English speaking TV series all the time. But we quite rarely speak or write in English.