All Things Distributed: S3 - The Amazon Simple Storage Service: "Go check out the Amazon Simple Storage Service (S3). This is Amazon.com’s Internet scale storage service available through a web service interface. S3 is another example of the Amazon Web Services mission: to expose all of the atomic-level pieces of the Amazon.com platform. Providing scalable, reliable, secure and fast storage is something that Amazon developers have already enjoyed for some time and now it is available to the developer community outside of Amazon.com.
S3 has a simple programmatic read/write interface through REST and SOAP services, and the data can be access through different distribution protocols. HTTP and BitTorrent are provided in this first release."