I found a seller here who offers neoprene sleeves for the AC adapters (as a side product of their Macbook neoprene sleeves), but there's a picture in his website that shows the computer turned on and connected to a wall plug, and the adapter has the neoprene sleeve on. I was wondering if that wouldn't actually overheat the adapter and become a problem. 
[EDIT]: That neoprene sleeve for the adapter is only $6 bucks. I should get it, right?
[EDIT]: That neoprene sleeve for the adapter is only $6 bucks. I should get it, right?