The Intel Cloud Builder program has launched a forum and discussion boards today. I am not sure if you have seen it yet, but there is a great paper that outlines a number of cloud security use cases built around Intel(R) SOA Expressway. Grab the paper entitled "IntelÂ® Cloud Builders Guide: Cloud Design and Deployment on IntelÂ® Platforms."
The paper shows how Expressway can be used as a control point for some interesting use use cases: (i) As a secure proxy for auditable virtual machine controls, (ii) single sign-on using an on-premise STS to map internal credentials to SAML assertions for a payroll application and (iii) secure credential federation for a hybrid cloud environment in a cloudburst scenario. The paper has a lot of detailed information on what some of these applications might actually look like once deployed on Expressway. You can request an evaluation copy of Intel(R) SOA Expressway at the dynamic perimeter microsite, located here.