This is a case of the Internet solving a problem that the Internet caused. Back in the day, if you wanted to go somewhere, you consulted a travel agent, and he or she presented you with a neat little agenda, a smart little itinerary, and a not very little bill. Now that we book our own planes, trains, cars and hotels, maybe we can see why they earned their money. Or maybe we can just see how useful an app and service like TripIt is.