- According to the webiste: "Plan a Group Trip -- Create your trip, then use our tools to:
* store and share travel research; * manage invites; * conduct polls; * coordinate travel; ...and more."
- According to the website, you can "Easily plan and organize your trip for free! -- Create a Trip Home Page; Invite people to join the trip; Send Invitations; and Discuss & Share Plans"
Triporama currently appears to have a few more features, but TripHub may be easier to use. I suspect that competition will drive them to each add more tools to one-up the other. Both provide tips and ideas for group travel.
From my own experience, making group travel arrangements is not the easiest thing in the world to do in a smooth and painless way. So if you are given that responsibility, you might want to check these two sites out for tips and help to ease your planning efforts.