So far I've only been using the following:
1) Completed the Stanly 5.1 ICM class
2) Completely read VMware vSphere 5.1 Administration
3) Re-reading Scote Lowe's 5.5 book finishing up chapter 5 now
4) used a near replica home-lab of a production network with SAN fabric (not going into detail most of you know it)
Also
Career Adacemy, anyone have a take on them?
I'm curious what others have used or recommend - at what point will my studies be overkill?