Logs

Here at shullian.com I keep three sets of traffic logs (plus download logs); one master list of my own, as well as two third party ones (Google Analyics and StatCounter).
Right now this data isn't really important, but it's still really fun. For example, I can see who is linking to my site (I was able to understand the German blogger - but not the Japanese one). I can also see where people are (for some reason the Germans have always given me a lot of attention - second only to the USA). And thankfully there are more hits from Mac users than Windows users!
If you haven't already, be sure to check out the visitor map (based off my own logs) to see a piece of this in action.