It depends in the location of the dent...if you can get access to behind the panel you can try to push them out, this is pretty easy...
Otherwise I think you have to do the method or pulling the dent out via a screw, building it up, sand it, the repaint it...[:@] I dont know of any other serious interim methods...aside from:
andI dont know if it works or not, or is a gimick...its called the Door Doctor, or the Dent Doctor, and its like a suction cup that pulls the dent from the outside...so you dont have to repaint...
maybe there is some place local to your area...
http://www.dentdoctorcanada.com/