My situation: I manage a small business, and would like to migrate the files on our local file server to a 'cloud' service. There are a large number of 'file storage' and 'file hosting' services (S3, Rackspace Cloud Files, Dropbox, ...). They offer 'features' (versioning, sharing configuration, smartphone apps, ...), but no services seem to offer the obvious: an NFS filesystem that I can mount simply and securely on our UNIX boxes.
Obviously, I could set this up myself with a dedicated server in the cloud, but part of the incentive to move to the cloud is that my server's configuration is taken off my back. So: what services exist that offer NFS hosting?