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WikipediaThe Times in the U.K. via if:book. Excerpt:

Wikipedia, which started in 2001, will notch up around 2.5 billion page impressions this month. According to Mr Wales, its traffic volumes are doubling every four months.

The combination of ultra-low overheads and massive readership would excite any media executive. And while the site does not carry any advertising, Wales admits it might. “There is a great deal of resistance to the idea, both from the community and from me. But at some point questions are going to be raised over the amount of money we are turning down,” he says.

 
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