TripIt is now available as a GoogleApp for to share your travel plans with your domain members

TripIt started allowing you to log into their site using your GoogleApps login. Now you can take that a step further and create a TripIt group that includes all the members of your GoogleApps domain.

More information is available on TripIt’s blog posting.
http://blog.tripit.com/2010/03/new-tripit-for-google-apps-.html