For those of you who sell digital products, such as ebooks, audio downloads, etc. What system or software have you used with the most success? I've heard about a lot of drupal solutions, but I would love something that fits like a glove into WordPress. But first and foremost, I'd be interested in hearing what you guys are already using out there.
I am also looking for a solution. After using some paid and free shopping cart software (Yahoo store, nopcommerce) I decided the best route for me is to learn ASP.NET and build my own. I am learning a lot and am worried the site will have some issues, but in the long run it will be my site and I am learning a programming language (server side) which I always wanted to do.