Copy data between S3 buckets
AWS Pipiline seams to be a nice tool coming up. It is currently only available in US regions but I'm sure it will come in more regions. One thing I don't see that it does handle thputh is copying data between buckets in different accounts. There is a Hadoop that handles this, s3distcp.
I'll give this tool a go.
After checking the documentation I realized that this tool only can work within one account. This is not what I need so I guess I'll have to write a small script myself.