Close the macbook pro when using external display

Hi
I would like to know if is recomended to close the laptop when using an external display? i ask because i read somewhere that the system take ventilation through the keyboard? is better to work with the laptop always open? or doesn't matter if is closed?

Third opinion...
I had a 2.16GHz 15" MacBook Pro that I used as a presentation machine at some trade shows in '07 and I once ran the machine with the lid closed, hooked up to an overhead projector looping a movie for 11 hours. When I finally shut it down for the night the machine was pretty warm (it was well ventilated) and was immediately usable. Out of curiosity the next day I ran it with a lid slightly cracked and the unit was significantly warmer at the completion of my day.
The only thing I could justify as the temperature difference is that the LCD was on and causing heat in addition to the video card. I guess I would have been curious to leave the lid slightly cracked and then manually set the backlight to off.

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"I found a solution for this.. my solution is to put a fridge magnet directly right to the return key (about 2 cm away from the right usb port)... so the laptop thinks the lid is closed and so the display is off.. lol.. try it.. it works.."
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Some will also ask if it is safe to use a magnet on your MBA etc. You are only placing a magnet where the magnet from the lid would go anyway's. Just make sure you don't use a super magnet or something and you should be all good ;-)
Here are the image examples:
MBA is powered on
MBA is now asleep
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(Note: I used a small piece of paper under the magnet to protect from scratching my MBA)

I also made a video

Close the macbook pro when using external display

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