On the main page at the bottom there is a section that shows how many visitors (both registered and non-registered) in the past 30 minutes. If you click the link Recent visitors in past half hour you'll see an interesting page with some neat facts like the record amount of visitors at one time, and the 20 most popular topics in the past half hour.
Oh yeah, I also turned the polling feature on so everyone can create a poll which is kind of neat. Please only post a poll if you REALLY want to find something out from the members that would best be handled by a poll. If we start getting tons of polls we'll get poll overload and only a couple of votes for each poll.