Strong incentive to dive in to CloudFront CDN it seems. Transfer from AWS to CloudFront 'edge' caches is now free, and outgoing from CloudFront to the internet is nearly 30% cheaper all of a sudden.
cloudFront has been cheaper than S3 for as long as I can recall. And it makes sense with the way amazon does cost based pricing. Its cheaper to transfer cached bits fromthe edge of the network than pull it from inside of multiple datacenters.