What is the best trip planner?  I know there are online tools that will help me organize my trip, but I'm not sure which one to use.

I'm looking for an online trip planner that will allow me to plan my trip, organize my itinerary, have mobile tools available while I travel, and allow me to share information and photos with friends while I travel.

If anyone has experience and a recommendation for the best travel planner, I would be very appreciative.