I've recreated a search terms zeitgeist for this blog. Previously, this was created by the Community Server, but now I've written a Python script that generates this zeitgeist automatically. I then integrated the whole thing into Wordpress's template system so the layout is correct too.
Of course, I've excluded this page in my robots.txt for the search engines, so that these search terms and links back to the search engines aren't used by them again for PageRank calculation - otherwise users would eventually only load on my zeitgeist page. And that would be Google spamming.
I always find this type of search term analysis quite interesting (by the way, I evaluate a whole bunch of search engines for this), as it makes it much easier to see what the web is interested in than with the normal evaluations that log analysis tools offer.