i have used belkin cooling pad. its quite good. brings the temperature down by 10-20 degree c. while in mumbai's warm climate it was fine. but in december end in New Delhi its fan gave some noise while starting. it stabilised after few times attaching and detaching from the usb port. reminded me of a FIAT padmini starting up in winter. Guess the fan of the cooling pad will be under pressure in cold weather :S