Check out this list of the 100 most viewed Wikipedia articles.
The most viewed page is “Wiki” which implies that a lot of Wikipedia searchers are new to Wikipedia and other similar sites.
After that it’s almost like looking at 5 different top 10 lists all smashed together. There’s the obligatory celebrity lists, like The Beatles, Michael Jackson, etc. There’s the “adult topics” list, which includes positions, body parts and so on. The “book report” list includes countries and historical events. There are a few movies with big marketing budgets, and all the most popular websites make an appearance.
Let me know if you see any more interesting trends than these. I’m sure they’re in there.