I think this is a growing field...you guys already have a competitor: http://www.imgix.com/ http://www.imgix.com/ They require you to have an S3 bucket for the

I think this is a growing field...you guys already have a competitor: http://www.imgix.com/ http://www.imgix.com/ They require you to have an S3 bucket for them to upload into--so they only handle the thumbnail generation.