Update (8/14/2007): This article is outdated due to incompatible of Wikifilter and the latest Wikipedia XML dump file. Check comments for the workaround.
Although the credibility of Wikipedia is not well respected among academic communities, that doesn't stop Wikipedia from becoming the most popular encyclopedia on the web. According to the update-to-date statistics, the English Wikipedia contains almost 2 millions articles. Don't scream if I tell you that you can store all articles in English Wikipedia in your computer and view them locally, because you can.