Our company uses fltplan.com for everything. What is cool is that you just enter the info ONE TIME and it puts it on the schedule, files flight plans, wx brief, passenger brief, FBO notification, sends route info and ATC delays to me, Fuel stops info, TOLD cards, current maps and charts for your route, and displays the most common used routes that other pilots use for the trip your doing.
What used to take a full hour to flight plan, you can now literally do in less than two minutes.
More recently, I have been doing everything on my phone. I can now quote a King Air trip in two minutes, and it will give me everything I need to know such as time en-route, and fuel I need on board. Nothing like forgetting to file your flight plan, push a few buttons while taxiing out, and have your clearance before getting to the runway!