Interestingly it would seem that Emulex is putting their effort into Hyper-V based on a quick look at the site and resources available for ESX & Hyper-V. I wonder if that has anything to do with EMC?
Hyper-V
Hyper-V Virtualization – Enhanced SAN Connectivity with Emulex
http://www.emulex.com/solutions/windows_server_2008/virtual.jsp
Virtualization Self Assessment Tool – Discover your ideal SAN environment for Hyper-V
http://www.emulex.com/solutions/windows_server_2008/virtualizationTool.jsp
VMware ESX – Support Documents
http://www.emulex.com/emc/support/vmware.jsp