I wonder why AC adapters don't have some kind of passive cooling. My notebook ac adapters get really hot, and those that belong to other things, such as my modem, speakers, etc. also get very hot. The components are only wrapped in a box of black plastic - not the best cooling material. Why don't they have fins of aluminum or something to spread the heat? That would make a big difference, and they might last longer. That said, I never had an AC adapter fail on me. Opinions?