A girl I know at work backed her brand new Jeep Liberty into another parked SUV last fall, leaving a dent similar to yours. She took it to a repair shop who only had to heat the plastic and gently press the dent back out. The bumper was good as new, and the repair cost ~$100. This should work if there is no paint damage, or if the damage is minor enough that you don't mind living with it. Break out the phone book and ask around about this method of repair, as it seems to be the best for this kind of minor damage to plastic bumper covers. Good luck!