The MBPs are made of aluminum, not titanium and the underside is one big massive heatsink. Try putting it on your lap after a prolonged Photoshop/Director/Doom session... 😀 Anything that can help move more air across the bottom of the Mac will help cool it quicker so the internal fans won't have to go into "jet turbine mode". That being said, I concur that the fan-equipped Chill Mats from Targus and others are a bit of overkill. Much cheaper, portable and just as effective are the CoolPads also from Targus, which only separate the MBP from the desk and allow a natural airflow without requiring power. I use a CoolPad at home and a PodiumPad at work, both from RoadTools, and my MBP never gets hot.