Jon Udell writes:
n March, Amazon.com introduced S3 (Simple Storage Service ), a metered storage service for arbitrary blobs of data. Recently, Amazons adventure in metered Web services continued with the announcement that its SQS (Simple Queue Service), which had been in beta since well before the surprise announcement of S3, has now joined S3 as a commercial offering.
Like S3, SQS is an extremely general-purpose service offering that will undoubtedly be used in ways nobody can predict. Its therefore appropriate that Amazon has tailored both services to the broadest possible swath of developers.