For those who use Laptops on a regular basics, you are aware that the underside gets hot very fast.  No wonder as that is where the battery case exists and where the heat is exhausted.  As a recent Laptop user I found a nice idea to assist in removing some of that heat.  No, not with a cooling fan unit (thought this is an excellent idea), but by raising those tiny bubble feet of the unit.  You can purchase felt pads at any Dollar store or some Hardware stores also sell them.  Might need to trim the pads, but it does work. Another tip is to place the Laptop upside down when you finish using it.  As heat rises, this will assist in cooling the unit, Mindblower!