From TechCrunch:
A new and unannouced Amazon Web Service to be called “SDS” is referenced on [a now pulled] Amazon web page discussing customer YouOS ….and is being tested with a select few Amazon partners. After a little digging, we heard that it may stand for “Simple Data Service” and will be launching sometime this year, although another source said that the name is incorrect. A representative from Amazon would not comment on whether the service exists or not.