The new Capital One card is based on the price of the ticket. You can use your travel agent (or theirs), an airline site, or a travel site like Travelocity or Expedia. The amount of miles required is 90 times the ticket cost. For instance, a $100 ticket requires 9,000 miles. I think it sounds kinda interesting, but there is a $19 annual fee.

I currently use a Citi Traveler Miles card with no annual fee. However, it requires 25,000 miles for a domestic ticket ($500 max, 21-day advance purchase with Saturday night stay). Also, you must purchase your ticket over the phone using their affiliated travel agency, and there is a $15 ticketing fee.