Some food for thought:
http://business.timesonline.co.uk/article/0,,9075-1962714,00.html
In an interview, Jimbo discusses the possibilities of ads eventually on the Wikipedia, due to the huge number of page views that we get.
Also mentioned is the large-scale rejection of ads by the "wikitopeans" [sic] in the community.
-- Ben Emmel Wikipedia - User:Bratsche bratsche1@gmail.com "A fool sees not the same tree that a wise man sees." -- William Blake