Read about this site in the Wall Street Journal a few weeks ago.

You sign up with the email account that you use for your travel reservations (you can link more then one email), and then when you get your confirmation (air, hotel, rental car) you simply email it to the tripit site and it will aggregate all your travel plans.

I've been using it for about a month and it is great. Spouse can simply log on and see all my travel plans - no need to be emailing them.

I highly recommend it - can't see any downside at this point and it is really useful for keeping tabs on future travel of multiple family members. (You can rename the trips for ease.)