the keyboard area is not an intake for airflow and I doubt the keyboard will suffocate with the cover on.
hi,after reading about spills on macbook keypads i got a cover for mine from the apple shop,it was pointed out to me as a good idea by one of the sales people,now im wondering if they are a good idea as it was mentioned on another forum and someone thought its a bad idea as air cant get to your keypad,its like a clear plastic,any advice would be welcomed.

Chowhound
Comic Vine
GameFAQs
GameSpot
Giant Bomb
TechRepublic