Ninefold (http://ninefold.com/) are a new cloud provider on the Australian scene, backed by Maquarie Telecom. They have a cloud compute and cloud storage offering and are being quite secretive about the implementation of the service. Just having a quick look at their documents, I'd have a quick guess as to what they are using.
First for the cloud storage, it looks like they are using EMC Atmos (http://www.emc.com/products/detail/software/atmos.htm). Their API guide is full of HTTP code like:
1 POST /rest/objects HTTP/1.1
2 accept: */*