I don't see how they can possibly build the "TripIt" communities they want, but with some reservations I'm giving TripIt | Online travel itinerary and trip planner a try.
The trick is that once your email addresses are registered (and I assume you need to register them for work, home, etc), you can email itineraries of various forms and TripIt managers them and also organizes them into calendars that have .ICS feeds.
Then you add the .ICS feed to Google Calendar and you can view them there. Presumably you can also copy appointments into Google Calendar.
Since I sync Google Calendars to my iPhone this is appealing.
More when I have some experience to report. They also have some LinkedIn support ...