You may have heard of Wikirank. It tells you how popular a particular article on Wikipedia has been in the last 30 days. You can even compare up to 4 articles on a chart which can then be embedded on your site.

Being a fan of statistics (I do take a plough through them every week) I just haven't been able to resist playing with this tool. Given that Wikipedia has 9,288,608 registered users alone I think it makes for an interesting measure of popular interest. For today's Friday Fact Box I've thus put together a few charts based on eMarketing topics. Drag your mouse over the charts to see the particular numbers.

If you make some interesting comparisons of your own, do let me know where to find them!