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CORS is now officially supported on S3: http://docs.amazonwebservices.com/AmazonS3/latest/dev/cors.html
Now you can do it! http://www.theregister.co.uk/2012/09/03/aws_s3_supports_cors/
Here is a jQuery version of this workaround: http://www.maxnov.com/getimagedata/
JSONP with b64-encoded data:image url could be a workaround
Looks like it might be Amazon's fault... http://stackoverflow.com/questions/4717006/amazon-s3-and-cross-origin-resource-sharing-cors
Kundesupport af UserEcho
Example: http://www.corsproxy.com/i.imgur.com/Nlc35.gif