i typically use my laptop while on my bed, and often leave it laying on it while running for some time while i'm away. today for the first time i've actually heard the fan running at a high speed for a continual amount of time. obviously this is bad as my laptop was quite toasty. is leaving it on something like a bed or pillow worse for heat disspiation than a desk? also, do those laptop cooling pads that plug into your usb port actually work? are they worth the hassel and cost?