One of the most annoying parts of traveling is keeping track of flight times, hotel confirmation numbers, and other details. These free services help road warriors collect all that information in one place, as well as share it with friends and colleagues.


Forward confirmation e-mails from airlines, hotels, and online booking services to TripIt, which will generate a trip itinerary with flight, hotel, and car rental details. You can choose to automatically add itineraries to Google Calendar or share them with members of your TripIt network. Creating a network is easy: TripIt gives you the option to e-mail individuals or send group invitations to contacts on LinkedIn or Web-based e-mail accounts such as Gmail and AOL.


Traxo keeps itineraries up to date by linking directly to the websites of more than 40 major travel booking services, airlines, car companies, and hotel chains. The site generates a trip itinerary and automatically updates it if any plans change. You can also assign different levels of access to members of your group, so you can share all your trip details with your assistant, for example, but not your whole staff.


Like TripIt, Dopplr requires you to forward travel confirmation e-mails to the site to generate an itinerary. The site alerts you when your plans overlap with those of someone else in your group and also creates annual travel reports. Another plus: You can send out Twitter updates on your travel plans directly from Dopplr.


More of a travel guide than an itinerary tool, TripTouch aggregates news, currency conversions, and photos for destinations once users type in their trip plans on the site. Users can search for deals on Priceline and Kayak on TripTouch and click on a link to see if members of their group are traveling nearby.