http://forums.dropbox.com/topic.php?id=53104
All you gotta do is upload some photos/videos from your phone or camera using the new beta version of dropbox.
Doing it via a mobile is a pain (especially with the amount you'd need to upload) so the easiest way to do it is to drag and drop a bunch of photos on to a removable USB drive, set it to autoplay and plug it into your PC. When you plug the drive in, choose 'auto upload to Dropbox'. Once this begins you will start getting an extra 500mb of free space every time you upload 500mb of pictures/videos (until you reach the 5gb limit).
if you don't have a dropbox account, you can get one here (comes with 2.25gb of free space to start with but use the method above to get it up to 7.25gb for absolutely free!)
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