Any way to prevent macbook air from sleeping when lid closed?

I believe there is no way to keep your macbook/air running when you shut the lid.
I am running a background job where I am downloading a huge amount of data from the internet, which is coming through slowly (other applications could be where I am running a web server....). I want the machine to be running, but not keep the lid open - since I might want to move the laptop, not leave the screen/keyboard exposed.
Where can I request Apple to add support for this behavior? Or did they anticipate this request in Mountain Lion already?
Any suggestions? Others who would like the same feature?

NoSleep makes closing of your MacBook lid possible without going into sleep mode. Now you shouldn't plug your mouse and monitor to stay computer awake - just check a tick in the System Preferences and continue downloading of huge files and watching favorite movies over the network with lid closed.
here you go : http://lifehacker.com/5934158/nosleep-for-mac-prevents-your-macbook-from-sleepin g-when-you-close-the-lid

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