Wow... that takes balls. Getting 0% introductory rate credit cards, and taking a cash advance... and then putting the cash in a bank account that pays interest. Of course, if the business fails - as it did in the author's case - then you're stuck with all of the debt and a broken credit record, but it's all about taking risks right?
Now, this kind of risk won't work as well in this economy. Credit cards have severely curtailed their introductory rates. However, in 2002-2007 I knew people who augmented their income multiple times by this same arbitage and putting the money in low risk investment vehicles. Once the intro rates were finished, they would pay back 100% and close the card, moving on to the next one.
The credit card reform act will make this more difficult in the future.