I am not going to explain how to make money using Google AdSense. Here I just put a real world example: a successful web enterprenur got a check from Google. Guess how big is the check: almost 1 million Canadian dollars. And here is the link. The nice thing about his web site is that he runs it by himself. So after he paid the web-hosting, and other service fees, he can put the money into his own pocket (after paying tax). Certainlly this is a very rare case. Also don’t think he built the web site and the business overnight, as a matter of fact, I believe he has done this for more than 3 years.
Not everybody can be as good or as lucky as him, but I think Google AdSense does provide a new revenue stream for many start-ups.