AWS News Blog
S3Stat – Log Analysis for Amazon CloudFront and Amazon S3
S3Stat now has the ability to analyze the logs generated by Amazon CloudFront using the venerable Webalizer package. With your permission, S3Stat will enable CloudFront logging for the distributions of your choice. It will then run Webalizer each day and deposit the report in S3 for easy browsing. Of course, as the name implies, you can also use it to analyze the logs produced by S3.
The service is free for the first month and then $5 per month thereafter.