If you are still wondering if a wiki has anything to offer then you've got to listen to, or read, this one. It's eight minutes of your life well spent. The 8 July 2005 edition of On the Media contained an interview with Clay Shirky about the role played by Wikipedia in responding to the London suicide bombings in a way that the mainstream media could not. There's still a lot of people in academia who don't understand what a Wiki is and what it could do either for themselves or their students; the Shirky item Get Me Rewrite could be a useful starting point. You have three choices: download the whole On the Media edition as an MP3; listen to the specific item as a stream; or read the transcript.