I thought that I read someplace that Disney's contract with Mears, who provides the drivers for the Magical Express, included the tip for the driver. However, most posts that I have seen, have advocated tipping the driver if he/she handles your luggage for you. For most who use the yellow ME tags for their luggage, which is then delivered directly from your room from MCO (supposedly the tip is also included with Disney's contract with the luggage handlers that also do this), and who also use the Resort Airline Check In for participating airlines to check their bags, instead of taking them with them on the ME, you wouldn't need to tip the driver. But I'm sure that if the driver goes above and beyond, any additional tip would be appreciated.