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There are now a large number of clones of Wikipedia's content on the World Wide Web, with various degrees of licence compliance. This is fine if they are in compliance with the GFDL; indeed, it was one of the original goals of the project. Some of them are high-quality mirrors, whilst others are poor-quality bags of spamdexing search-engine fodder.
What seems clear is that many of these clones are using search engine optimization techniques to achieve higher rankings on search engines than the original Wikipedia pages.
The question is: should we start to try to compete with these sites in terms of search engine rankings?