If you are interested in Wikipedia statistics there are several pages worth visiting.
Last time I mentioned the dumps page which provides source data for all analysis (how often given page was requested). Basically, there are two kind of logs: the original, and in a compact form — maintained by Erik Zachte. The latter makes the analysis faster (logs are aggregated to daily results, however hour values are added as well in the last column).
Erik Zachte (Data Analyst at Wikipedia) presents a handful of Wikipedia visualisations and metrics. His profile page and blog are good starting point. You can find a lot of useful links there to check what other people have already done in this matter.
There is also http://stats.wikimedia.org, page that you should browse if you are looking for anything related to Wikipedia statistics. One of my favourite example from that page is http://www.wikipediatrends.com.