One of the things that never fails to amaze me are the superb PDF diagrams I occasionally stumble upon so i thought it would be a useful idea to list some of the the ones I have found on my travels.
vSphere 6 ESXTOP quick Overview for Troubleshooting http://www.running-system.com/images/2015/04/ESXTOP_vSphere6.pdf
VMware vSphere 5 Memory Management and Monitoring diagram http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=2017642
Concepts and best practices in Resource Pools http://federicocinalli.com/blog/item/194-concepts-and-best-practices-in-resource-pools#.Uzre1_ldV8F
Network port diagram for vSphere 6.