Ok so we built a version that works with Azure Blob Storage as too. This version doesn't have the same problem as the Amazon S3 version as we can store Created and Modified dates as additional meta data and return it in a single request.
We're going to use this provider on our Web Server to maintain a backup of all our Web Sites and Client Sites in Azure so if we loose the server we can restore very quickly. In fact we use Quvvi to backup all our databases daily as well and now we can use this provider with Ouvvi to post the backups to Azure automatically.
Download the provider here (requires Data Sync version 3.0.352).