Last week Google announced the availability of Buy Now buttons for the exclusive purpose of selling digital goods. If you're an e-book seller or provider of individual software downloads you'll be very interested in this development.
What's so unique about Buy Now buttons from Google Checkout is that buyers (once their card has been successfully authorized) receive instructions on how to access the items purchased using the URL and "Key" you specified. This is big news in the world of "digital delivery."
A button creation wizard is available on the 'Tools' tab on your Checkout merchant accuont - just select 'Digital Good' from the 'Describe your item' drop-down list. You can learn more about creating buy now buttons for Google Checkout in the Google Checkout support section.