All links on Wikipedia now automatically use the "nofollow" attribute, which means that when Google crawls the site, none of the links it comes across get any PageRank from appearing on Wikipedia. SEO contest concerns aside, this also has the effect of consolidating Wikipedia's power. Now it gets all the Google juice and doesn't pass any of it along to the sources from which it gets information. Links are currency on the web and Wikipedia just stopped paying it forward, so to speak.
Though, to be honest, Wikipedia could steal my girl, key my car, and salt my lawn -- and I'd still think I'm getting the better end of the deal.
