There is much argument over whether the MacBook is a notebook or a laptop. Whichever, it does run a bit hot on one's lap. In my view, portability is the great advantage of a notebook/laptop over a desktop and I want mine to be easily-transportable. Having to plug a laptop cooler with fans into the wall, or even to a USB port, for comfortable use renders it less so. I recommend the APC Ergonomic Mobile Cooling Platform, model EMCP, sold at CompUSA for $34.99. It keeps legs and computer cooler. Its dimensions are near-perfect for the MacBook. Non-slip rubber pads on the surface hold the computer securely and allow air to circulate between computer and platform. There is a fold-out mouse pad which works great with an Apple Bluetooth wireless mouse. It also has retractable legs for use on a desk. It is very light and will fit into most computer bags. I can't think how it could be any better.
MacBook Mac OS X (10.4.7) 2 Gb RAM, 120 Gb HD
MacBook Mac OS X (10.4.7)