get brittle and break! I’ve just found out that, if you _carry_ your mac and work anywhere, camping out and in continuously, the thin cable (one with magsafe adapter) gets mighty hot while computer _shugs_ along. It gets hot to the point of getting brittle as time goes by and cracking when you wind it for storage… Priceless, er, $80 bucks at the apple store. To all my windows friends, here’s your chance to call me on the apple tax 😉
Anyways, let your cable cool down before coiling… sounds general enough advice to give.