Usage logs can provide useful inputs to user interface and web site designs. But all too often, naive interpretations of log data produce poor (or, at least, unsupported) design decisions. Here are a few of my concerns about the question, "What do the logs say?"
What is good software documentation? What do you use? What categories exist? What tools do you use? What sounds useful but isn't? What would you most like to see? Stop complaining and start writing.