Gogobot.com

Gogobot.com is another travel plan webapp.  It differs quite widely from TripIt as it concentrates more on the planning side of the trip than the logisitics.

I would go as far as to say Gogobot is more personal and TripIt more for business related travel.

Gogotbot allows the user to create trip plans and then find top places and recommendations from friends and other users.  It's useful if you are going somewhere you have never been before because you can ask other users for advice on where to visit etc.