Yes its been mentioned a lot. At the moment this is one option....
Can Shopping Cart Creator Handle Downloadable Products?
Article ID: 565 | Published On: Dec 5, 2008 | 2,808 views | Rated 4 stars by 5 people
Shopping Cart Creator is equipped to handle downloadable products in the same way it handles physical products. This gives you, the shop owner, the most control over your inventory. Please note that the delivery process is not automatic — see Step 3 for information about how to handle delivery.
1. Set up your products within the software.
2. When a customer places an order, you will receive an e-mail notification with the order details.
3. Respond to the customer with a download location for the product. We recommend using secure services such as YouSendIt or SendThisFile.
I know you believe you understand what you think I said...but I am not sure you realize that what you heard is not exactly what I meant.