The power brick on the Rev A 12" PB I recently sold got very hot. I don't think it used to get as hot as it does now, but I could be mistaken. My 15" PB brick doesn't get hot. If it is a defect, I would be happy to send the person I just bought a new brick or money for one; I certainly woudn't want the person who bought my PB to have a fire hazard. However, from what has been said so far in this thread, it doesn't seem to be a defect, so I am reassured. Anyone else know more about this or have info straight from Apple?