"Fantastic file uploading for your web application"

"A single unified interface to manage your Amazon Web Services environment - S3, EC2, SQS and SDB". $50/month.

"robust, fast, and secure Ruby interfaces to Amazon EC2, Amazon S3, Amazon SQS, and Amazon SDB". Uses libxml if available.

"small blog engine with XMLRPC, hAtom and S3 upload (through xlmrpc) support". If Blogger ever starts to do me wrong, this is a good (re)starting point.

"a set of simple services built on top of Facebook’s Thrift framework that provides indexing and document storage services for building and scaling websites"

Yet another EC2 load balancing service deal.

Web Log Analysis for Amazon S3

use S3 as a powerful file system from EC2

Mike Clark on Rick Olsen's rewritten acts_as_attachment. Totally beat me to the S3 storage backend.

a web-based transcoder. takes in a URL to a video, churns away on EC2, spits out the result on S3. brilliant.