The Daedalus Project (by Nick Yee) is a portal to five years' worth of articles and research results on how people play games (MMOs in particular). A lot of the data is survey-based and it's collected right there on the site.
If you game, and you don't mind being a research subject, visit Daedalus and participate in some of the ongoing surveys. If you're interested in MMOs and how people interact inside them, check out the research results.
