TripIt is a personal travel organizer aimed at both casual and business users. If you forward your electronic travel confirmations (from an airline, car company, hotel, etc.) to it, TripIt will intelligently collate them all into one place, parse the information, and add related information as well, such as maps, weather, events, and photos of where you're going. The goal being to replace all your pages of printed confirmations with a single online page that has all the relevant info nicely organized for you.
Along with its site, the service has applications for mobile phones, and a mobile-friendly Web site, which gives you access to all your information without having to dig around in your e-mail for dates and confirmation numbers.