SmartDD is a awesome looking tool that allows merchants to sell digital products without people sending the download link to all their friends (or worse, posting it at digg.com ). What it does it when someone purchases the product, it emails them a dynamic link. When the download is done, the link is inactivated. The following the smartdd follows up via email to make sure the download was successful. The best part of this software is there is a free version for those who only have a few items. You can try it and in the event you need more flexibility you can upgrade to the full version for around 75 bucks. Sign up for Free Version
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