Today, Amazon announced support for Import/Export Service. You can send disk(s) of data to Amazon and they will upload your data to S3 @500Mbps. Bucket Explorer added support for all the prep work that you will need to do in order to send a drive to S3.

You can read more about Bucket Explorer & AWS Import Export Service on this link:
http://www.bucketexplorer.com/documentation/amazon-s3–aws-import-export-service.html

You can follow updates of Bucket Explorer at twitter too:
http://twitter.com/bucketexplorer