Plenty of folks are making a living online out of selling downloadable files. Audio, video, documents, and pictures can all be sold online as long as you have something unique to offer. Sell Downloads is a handy plugin that lets you sell files on your site using PayPal.
Sell Downloads is easy to use. You can easily define price, file for sale, demo, file type, and other settings. Duration, publication year, image, and other information for your downloads can be changed easily also. The plugin gives you access to sales report too.
Sell Downloads makes selling your own work through your site easier. It is highly customizable and provides you with sales stats. It is a free plugin.