If you haven't discovered it yourself lately, our friends at Wikipedia are going through a new donation run. In my opinion, few sites on the web provide as much honest internet value as this project. I can't count how many times I've killed hours traversing articles going down related information paths and ending up on interesting topics that had nothing to do with what I had originally visited for.
I encourage you to take a moment over the next few days and throw a couple of bucks their way, bandwidth is expensive you know!