Want to really see what's going on and with whom?
Access Log Viewer will take your access log and turn it into something easily readable by a human. It also will help take that that data and analyze it, turning it into a basic reporting tool. I use this on my site to track down dead links and scripts that aren't running correctly. It also lets me know when someone is trying to be naughty.
This isn't Webalizer or Analog or Webtrends. It's raw data, that makes sense. And it's free.