I have always been impressed with the quality and quantity of free eLearning material that VMware provides, and they have just released eLearning: VMware vSphere: What’s New [V5.5]
The course is short and sweet, Self paced and is estimated to last around 1 hour.
The course can be found here – VMware vSphere: What’s New [V5.5]
Below is the official overview from VMware.
Self-Paced (1 Hour)
including vSphere ESXi Hypervisor™, VMware vSphere High Availability (vSphere HA), virtual machines,
VMware vCenter Server™, storage networking and vSphere Big Data Extensions.