If there are community contributions that are open for review, I'm interested in looking at them.
I started a quick-n-dirty Grails S3 browser to aid with some issues. It was a developer tool for debugging just the Walrus S3 API. I ended up using both it and the ever useful EucaLobo. There was no IAM support built into my quick s3browser but was looking at it.
If I get some time to clean it up a bit, I'll share it back out on GitHub. If nothing else it will serve as a useful example of getting Eucalyptus 3.3.0 working with AWS SDK in Grails 2.3.