Wikirank – What’s Popular on Wikipedia
http://wikirank.com/en

Wikirank shows you what people are reading on Wikipedia. It’s based on the actual usage data from the Wikipedia servers, which the Wikimedia foundation makes available as a public service. They take that data, process it, and give it back to you in a format that’s easy to use and share. Wikirank reveals emerging trends, and lets you embed relevant charts in blog posts and on social media sites. This has been added to the tools section of Research Resources Subject Tracer™ Information Blog. This has been added to Business Intelligence Resources Subject Tracer™ Information Blog.