Note! This project is now an official Drupal project. You may download it by going here: http://drupal.org/project/amazon_s3_logs
Using an Amazon S3 account is ideal for web sites with lots of content, but unfortunately Amazon doesn't make it easy for you to track traffic and visitors to your site. That is where this drupal 6 module comes in. Assuming you have correctly set up a log bucket on your account, this module makes it easy to get basic usage stats at a glace for all your files.
You're site doesn't even need to be a drupal site to use this. If you want, you can always have a drupal installation whose only purpose is to run this module.
See this module's project page on drupal.org for instructions on installing and setting it all up.