Just wanted to add a word of caution here that may not apply to everyone, I did this with my REI card (US Bank), so I got a 0% APR 15 mos. advance for 4% fees. Sounds ok, but the only catch is I like to use my REI card for the 5% cash rebate, and apparently the cash advance counts toward your balance, so basically there is no grace period.
Now whenever I use my REI card, I get charged interest, and US Bank has a $2 minimum interest payment, so even if I charge something for $30 and send a payment the next day, I get charged $2, and my rebate (from REI next year) would be $1.50.
It's not a big deal, but it's annoying and adds up over time. I suspect most cards are like that, so my advice would be to only use this on a card you don't plan on using for anything else.