Google has Google Trends, Twitter has trending topics, and now so does Wikipedia. Pete Skomoroch, a Senior Research Scientist at LinkedIn and blogger at Data Wrangling, built a trending topics page for Wikipedia. The homepage ranks the top-25 Wikipedia articles with the most pageviews over the past 30 days, as well as the fastest rising articles in the past 24 hours.
More: http://techcrunch.com/2010/03/11/wikipedia-trending-topics/