Notebook coolers are only useful for components located on the underside imo i.e. hard drive, memory (some) etc. Depending how exposed these components are and what material is used will effect how well your notebook cooler works. Other components such as cpu which is usually located under the keyboard will only benefit from the side affects of less heat build up in the laptop.
I was looking at how air flows through my cpu and was considering doing some modifications to the backplate of the keyboard by drilling some holes and allowing cool air to seep through the keys. The current situation seems like the backplate is right against the cpu fan so there is a lot of back pressure on the fan, not to mention its sucking up warmer air from elsewhere and then expelling this through the heatsink.
I use to play around with maximising cooling performance on desktop machines. I use to make my pc as quiet as possible til you can't hear it at all. There are great articles and forum discussion at
www.silentpcreview.com