Back when I graduated college in 2002 into the tech bust and kept getting credit card offers to "transfer my balances at zero interest for six months", I took a

Back when I graduated college in 2002 into the tech bust and kept getting credit card offers to "transfer my balances at zero interest for six months", I took a bunch of zero-interest cash advances and put them into the ING savings account yielding 3-4% at the time. I did it for between 6 months and a year and netted a few hundred bucks before closing them all out. I wouldn't recommend it because a) it was more headache than it was worth to keep track of payments, and b) who knows what it did to my credit score. It was definitely an arb, but probably not operationally worth it...