There is a link being passed around the library community with Michael Colbert’s report on Wikipedia. Here is the link: http://www.youtube.com/watch?v=A7W42aE9kao&mode=related&search. This video critiques the credibility of wikipedia, an online encyclopedia where anyone could add or change entries.
For the good or bad, I believe wikipedia is here to stay. I admit that I have used it as a resource for certain types of questions, especially those which require recent/current information, that is not yet available in books; that said, I would not personally resort to wikipedia as an authoritative resource. Instead, I would look to more authoritative sources to confirm what is said in wikipedia. Still, much like with the Internet, books and journal articles can not always be trusted, that is why it is crucial to confirm what is said in more than one resource.