With the growth of online advertising, many businesses are evolving from paid business models to free ad supported business models. The Economist had an interesting article on the topic in “The World in 2008” special edition: Freenomics – Online, there really is such a thing as a free lunch.

I just came across an interesting take on the concept: Big Sister. Big Sister is a brothel in Prague where customers can use the women’s services for free, subsidized by paying Internet viewers!

You can learn more about the company on Wikipedia at:
http://en.wikipedia.org/wiki/Big_Sister_%28brothel%29