I started out by going to some of the pages that track discount fares and offer online reservations. If the fare from, say, Memphis to Honolulu changes dramatically, you get an e-mail telling you so.
Kasbah is a database of hand-picked Web sites on just about any place in the world.
In other words, they don't claim to compile all the information in the world, they just look for good sites that have it and let you know where they are. So, still in the mood for the Elvis Cruise, I went looking at pictures of the Caribbean, read about shipbuilding in the Abaco Islands, and made note of some recommended snorkeling sites. Next, I visited the online versions of all the airlines that fly into Memphis. The catch is you have to leave that Saturday and come back Monday after 11 or anytime Tuesday. Most of these other airlines offer versions of the same thing, but since it's generally from their hub cities, Memphis only shows up in, say, a US Airways hookup with Philadelphia or a Continental hookup with Houston.