I inquired about the same thing a while ago. The really good notebook coolers are pretty pricey for what they are. Try undervolting. The Notebookreview.com forums has a good guide on how to do it. It is easy to do, and is harmless.
I undervolted my DV2 and managed to reduce the temperature by ~20 degrees, and extended the battery life an extra 30 mins. Undervolting my Asus managed to reduce the temps by 10 degrees and extended battery life by about 15-20 minutes.
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