[nag]Well the interest shouldn't be an issue since you should pay it off every month [/nag]
We have the United Airlines Visa, and while there is a $60 annual fee, I'm flying free to Orlando this December and we're both flying free to Maui next June. Plus we'll have enough miles for one flight to Europe.
Granted we put a lot on the card every month, but it's what we would spend otherwise.