The update that David Anson made to his BlobStoreApi adds container management, fragmented response handling, other improvements, and enhanced Amazon S3 support by Delay.Web.Helpers.
Source: Delay's Blog
While I hadn't thought to get back to blobs quite so soon, finding out about the fragmented response issue kind of forced my hand. But all's well that ends well - I'm glad to have added container supported to Delay.Web.Helpers because that means it now has complete blob-related feature parity with the WindowsAzureStorage web helper and that seems like a Good Thing. What's more, I got confirmation that the Windows Azure Managed Library does not support Silverlight, so my BlobStoreApi is serving duty as an unofficial substitute for now.