Megaupload (a free file host) makes its free users to enter a captcha and then wait for some time before downloading any files from their server.But now with this trick you can auto download from Megaupload without any time wait like a premium user.
This is possible by installing a Firefox addon called MU Bundle.All you have to do is go to the megaupload link of your file,enter the captcha and the firefox addon will skip the time wait and allows you to download the file instantaneously.
Firefox addon can be installed only after registering on Official firefox website since its currently rated as experimental.So register for an account,install the firefox addon and download from Megaupload like a premium user.(via ghacks) 
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Tried it, fail.
After captcha entered, doesn't load next window all the way before rebooting to captcha screen