I am not yet ready to offer my opinion, but I have been giving this whole Wikipedia thing a lot of thought. I first watched the Webcast of the opening keynoter at NECC 2005, David Weinberger, entitled The New Shape of Knowledge.
I then listened to a 02/22/05 NPR broadcast dealing specifically with Wikipedia.
Andy Carvin has also written a thoughtful essay that describes ways to use Wikipedia in the classroom. Give it a read.
As one who deals with using, organizing, accessing and evaluating information (and teaching others to do the same) on a daily basis, I am really torn.
PS Another interesting article may be found here, in the Village Voice.
Your thoughts and why?