Selling digital files just became drop dead easy with a new zip format called Retail Zip at www.retailzip.com. You can use your PayPal account to accept payments for extractions and use KodeKey passwords with archives to give out review copies of products here on DP. You can attach products to posts as zip attachments or use pre-made url links the program gives you. Buyers can pay for products without redirecting from a forum post. There are some other advanced features of the format you can find on the website and the format is backed by amazon.