This morning a little birdie pointed me to an HP Reference Architecture document that is hot off the press: HP BladeSystem Reference Architecture: HP Virtual Connect Flex-10 and VMware vSphere 4.0 which appears to be the vSphere 4.0 update to the previous reference architecture HP produced for VI3.  If you’re running or architecting vSphere deployments with HP blade systems (as a number of my clients are), you should check out this doc.