MacBook Unibody Lid Closed + External Monitor - Will it warp??

I've managed to figure out how to get only my external monitor working with my MacBook by using the put to sleep method.
However, the post I read about this technique mentioned you may want to leave the MacBook lip open to help cooling and prevent warping. Will the aluminum and glass really warp?? Should I really keep the lid open?
Thanks.

http://docs.info.apple.com/article.html?path=Mac/10.4/en/mh1963.html

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