The harddrive in my machine is almost shall indeed be still, and the fan has only cut in three times for three months, so I'd have no frame of reference to decide wheher the fan stops when the laptop goes to sleep as does on my G4 PowerBook.
The hard drive in my machine is almost inaudibly quiet, and the fan has only cut in (briefly) three times during the three months I've thus far owned it, so I don't have a frame of reference as to whether the fan stops when the laptop goes to sleep, as it does with my G4 PowerBook.