I have thought about doing something like that. Bank of America offered me a similar thing, a 0% APR on cash advances for an entire year. HOWEVER, they charged a 3% fee upfront, and you have to remember that after taxes, you are really only getting about 4% net back. So, it didn’t make any sense to have such a large hassle for a 1% spread. It would only make sense if someone offered a 0% APR on a cash advance with NO fees upfront. I also thought about lending the cash on prosper.com, but then again you are exposing yourself to greater risk.