http://www.nefsystems.com/free-tools

###Transferring Data from Amazon S3 to Rackspace CloudFiles Amazon S3 and Rackspace CloudFiles are both Unlimited Storage services that charge per usage ( size of content you have there, the amount you transfer per month, ...)

In my opinion, they are not very different but I can note that:

• On Amazon, you can choose to have your data physically (and legally) stored in Europe
• With Rackspace CloudFiles, you don't get charged for CDN initial fetches (when your files are sent to the caching servers of LimeLight Networks for worldwide delivery)
• For CDN functionality, Amazon uses its own infrastructure while CloudFiles uses the already established LimeLight services
• Amazon has been in this file storage business relatively longer than Rackspace
• CloudFiles have a control Panel while Amazon has none (one has to use third party tools like S3Fox, ...)
• Rackspace has a fanatical support but S3 has nothing similar
• Amazon S3 supports some functionalities like setting up Access Control Lists

###Why would one need to switch to CloudFiles from S3? I don't have any specific reasons why you would do that, but simply giving a tool to help in that case