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 โ€œThe World in 2008โ€ special edition: Freenomics โ€“ 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 womenโ€™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