In a SaaS deployment of ArcGIS Server I would like to see ESRI leverage Amazon S3 as a storage platform for Geodatabase Attachments for both ArcGIS Server and ArcGIS.com so that I can easily scale while keeping costs manageable. Blob storage works well in a typical Enterprise environment but as more companies are moving to Public and Private Cloud deployments cheaper storage alternatives such as Amazon S3 make sense. Additionally this would be a great feature for Services published to ArcGIS.com which currently does not support attachment functionality.