I have started using an external monitor for my 2.33ghz MBP. Ive noticed that while just idling on the desktop for a while, the fans will go off and reach speeds up for 5500+ RPMs. I keep the main display off and just use the external with the lid closed. I wanted to know if there is anyway to reduce the fan speed, and if it is allright for the machine to stay like this for long periods of time such as days or weeks. Thanks.