Amazon just announced a new Transfer Acceleration that allows for a 300% increase in S3 bucket data transfer speeds.
“Transfer Acceleration is designed to maximize transfer speeds when you need to move data over long distances (like across countries or continents) and into or out of Amazon S3 buckets. With this new feature, there are no gateway servers to manage, no firewalls to open, no special protocols or clients to integrate, and no upfront fees to pay. It can save hours (or even days) in transfer time, you only pay for data that is accelerated, and buckets can be enabled by simply clicking a button in the Amazon S3 console.”
Read more about it under the Amazon S3 Developer Guide.