The only thing you can really do to get more ventilation is to use a Notebook Coolpad (see -- they also sell them at Office Depot, etc)-- these cost 29.99 retail (or less when on sale --I paid 19.99 after a rebate) and raise the rear of the notebook about 2 inches (or you can use 2 other settings that are lower).

This allows air under the notebook where the vents are and also gives you a typing position more like a desktop keyboard (slightly raised at top).

I use this with my Pentium M Centrino even though the fan is almost never on as I like the typing position, any spills to the left or right of the notebook will go under the notebook (spills on top will still go in) and you can swivel the notebook to any angle as well.