Using 0% Intro. CC's for income?

[Berkshire_Bull]

OK, i have been looking around this board and a couple people have mentioned making money off 0% intro. credit cards. I get probably 5 offers per week and I'm ready to stick it to em, so to say. I understand it will lower your credit significantly, but I don't plan on borrowing any money for at least 5 years. I understand the principle, but can someone run through the strategy with me? John Galt? I've seen you mention that you have been successful with such an endevor.

Thanks all