Amazon announced that it is expecting to roll out a Content Delivery Network before the end of the year.   As a user you will store your files on S3 and then make an API call and get a new domain name to use for your web pages.  This is different from the functionality already availible in S3 because when the website visitor accesses your file they will be routed to the nearest edge location.  This will allow for latency and the highest data transfer rates.  Below are Amazon’s goals for the content delivery service:

• Lets developers and businesses get started easily – there are no minimum fees and no commitments. You will only pay for what you actually use. 

• Is simple and easy to use – a single, simple API call is all that is needed to get started delivering your content. 

• Works seamlessly with Amazon S3 – this gives you durable storage for the original, definitive versions of your files while making the content delivery service easier to use. 

• Has a global presence – we use a global network of edge locations on three continents to deliver your content from the most appropriate location.