The program can simultaneously support multiple Amazon S3 accounts, as well as process large numbers of files (several million) in an effective way. This, of course, allows you to drag and drop files from one account to the other very easily.
Other options let you share your 'cube' of files with other users or publish your content directly using Amazon S3.
S3 Browser is a very useful tool for the users of this Amazon service. Use it and you'll have a much more comfortable workspace.