I was skeptical about this, because I was unsure about privacy. But, all that is required for registration is a screen name and an email address, and that can be a yahoo.com or some such. You don’t give your name, your address, anything.
Basically, you forward all your confirmation emails for your trip to tripit, and they organize it into an itinerary that you can print, or access from your laptop or smart phone. For instance, for our upcoming trip I forwarded the flight plans, rental info, hotel info, and dining reservations… and a minute or two later I got an email saying my itinerary was ready. I opened the tripit app on my phone, and there was my trip, complete with confirmation and reservation codes, seat assignments on the planes, room preferences, addresses and phone numbers of restaurants and hotels, prices, everything that was in all the confirmations.
Of course there are suggestions for dining, attractions, etc; but they are subtle. No popups, no sound, just links for restaurants, shops, and entertainment. Very tasteful and actually helpful, IMO. You can also link itineraries to those of traveling companions; if we were traveling with several other families, we could link our trips and information on tripit automatically. There are options for other social networking links that I didn’t explore; I don’t Facebook much.
I like it. I didn’t want to, and I worry about giving up private information, but I like it and feel comfortable with it. It’s a cloud app, and it is a good one.