+1 on the above. My credit is mid 700's as well and I have 5 cc's, all with no balances, but I get those mailings once a month or two that include the checks to to balance transfers or just buy shit up to my available balance and the last one I got was .09% until Dec 07, or 3.9% fixed until its paid off, and my available credit on that card was $14,000, so just where you are. I considered paying off my car with that credit card offer, being as that my car loan is 6.19%, so almost 3% lower, but it would KILL my utilization, or my debt to income ratio and having unsecured credit looks way worse than having a loan.
I mean, more power to you if you are happy with the rate, but check out Chase or anyone of the other 0% balance transfers etc. I've had good luck with chase so far, both my cards have less than 9% rate on purchases if I ever leave a balance, both are rewards, one is 3% cash back, one is "sony points" but I got 10 free movie tickets to AMC, neither have any fees, and my combined available balance between the two is over $20k, and I'm only 21, god forbid me ever racking up that much CC debt.