His new article, Commodity Computing with Amazon's S3 and EC2, starts out by reviewing the basics of S3 and then digs deeper into performance and security. After a brief review of EC2, he describes his own s3_glue, a C++ client library for S3. You can find s3_glue attached to this discussion board thread.
While the overall review is positive, Simson identifies some areas where there is clearly room for improvement. We find this kind of information to be extremely helpful. The feedback that we get from reviews, discussion board messages, audience Q&A, and private emails is taken very seriously and feeds directly into our product plans.