A leaf blower is a great way to dry your car but I always recommend using an electric blower over a gas one. Reason being that you may drip or spray gas on the car accidentally while using the blower.
I also always recommend using a dedicated blower just for your car. By this I mean don't use it to mulch the grass or leaves on Saturday morning and then use it again to blow dry the car in the afternoon. You will surely hurl bits and pieces of debris at the cars surface, which would not be good:bigscream
As I have said before, I have used a leaf blower for the last 6 or 7 years and never had a problem. The best way that works for me is after a final rinse I start from the top and work my way down, open the engine areas and trunk areas and blow out the water run-off areas. Open up the door jambs and blow those out plus the wheels.
I then go over the whole car with some QD and a few MF's and viola! It's done!
Anthony