One of the reasons I like eXTReMe Tracker so much is because they have a cummulative report on the keywords that visitors use in seach-engines to reach your site. When the programm runs for a longer time it gets obvious what visitors are looking for. This is only the beginning of this list. It will grow steadily and in a few years this will get very interesting. It teaches me what the public looked for and decided to click on. If I would like to know which search-engines brought visitors to this blog, that is visible as well.