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: */*
3 x-emc-useracl: john=FULL_CONTROL,mary=READ
4 date: Wed, 18 Feb 2009 16:03:52 GMT
5 content-type: application/octet-stream
6 x-emc-date: Wed, 18 Feb 2009 16:03:52 GMT
7 x-emc-groupacl: other=NONE
8 host: 126.96.36.199
9 content-length: 211
10 x-emc-uid: 33115732f3b7455d9d2344ddd235f4b9/user1
11 x-emc-signature: KpT+3Ini1W+CS6YwJEAWYWvIlIs=
A few short googles brings this back to EMC Atmos.
As for their cloud compute product, this is a little less clear, but I would tip it being based on Open Stack compute. The reasoning behind this is:
1) They wouldn't have built this themselves from scratch
2) It supports mulitple hypervizors (i.e. not VMware vCloud)
3) It supports the Amazon EC2 API and has Vmware support in beta - just happens to match OpenStack compute.
It will be interesting to see if any more information comes out regarding this. I think having an Australian based cloud storage provider is a step forward.