So Im going to a friends wedding in September - and was wondering what the latest airfare tracking website was. Sure, Ive tried Farecast, and love using their info when bidding on Priceline. And now, there is Yapta. This site looks to even store your account #s and mileage for you. And Im excited cuz my flight started out at $423 roundtrip - and is now down to $260 - and may drop a little further (even Farecast confirms this)... It will email you when the price changes (the amount you specify). More info here.