Originally Posted by Kogswell
Bike Tools Etc sells tubing blocks that are mostly used by framebuilders.
The description in the catalog also states that they can be used for removing dents:
http://tinyurl.com/96lcu
You could make a tubing block from wood. I did it with a drilll press and a band saw.
I don't get how those could possibly remove dents.
I saw a commercial once for this product that removed dents from car sidepanels using a suction cup (it was the same guy that sells Oxyclean) but I doubt anything like that would be possible for bike tubes (different materials, different sizes, etc).