I've always heard that dented cans may breed botulism. It has something to do with the pressure, I think. I'm not sure how that works, actually. In every grocery store I've ever worked at, if a can was dented it was not put on the shelf.
Weber Smokey Joe
18" Weber Kettle
22" Weber clone kettle
Curb-foundling char-broil gasser
WSM: Assembled! First cook: 8/25/06
Fanatical devotion to the Q