After my 'deer hunting' incident, where the deer's head had wrapped around my forks and put a baseball size dent (about 2" deep) in the right side of the tank, I talked to a couple of body shops and 'paintless' dent repair places. None seemed to want to do the job, so frustrated went on-line and found a couple of ideas.
The first item http://www.ehow.com/how_6462615_use-dent-motorcycle-gas-tank.html was using heat and liquid CO2 to pop the dent. Went to Staples and got a 4-pak of dust-off and borrowed the old-lady's hair dryer. After about 3 cans of air the dent had come out at least half way.
Then I attacked it with my Dent King kit which I already had. http://www.ehow.com/how_2098332_repair-dent-motorcycle-tank.html Working from the 12 O'clock position and going around a few times (12, 3, 6, etc.) the rest of the dent came out .
Saved big $$$'s and got the satisfaction of doing myself .