I am often asked to recommend "good books" for learning about VMware. I usually reply by telling the requesting party to go to the VMware website and look at the documentation provided there. And almost every single person that I make this suggestion to appears confused and/or insulted by my response.
There certainly are some great books on VMware products out there, and I'm not saying that these resources don't add value. But the simple truth is that the VMware product documentation is very thorough and generally explains things in great detail. For example, the main documentation for VMware ESX 3.5 Update 2 or 3, vCenter Server 2.5 Update 2,3 or 4 consists of Introduction to VMware Infrastructure, VMware Infrastructure 3 Primer, Configuration Maximums for VMware Infrastructure 3, Quick Start Guide, ESX Server 3 and VirtualCenter Installation Guide, Upgrade Guide, Basic System Administration, Virtual Infrastructure Web Access Administrator's Guide, ESX Server 3 Configuration Guide, Resource Management Guide, Fibre Channel SAN Configuration Guide, iSCSI SAN Configuration Guide, Virtual Machine Backup Guide. Think of this as a free 13 chapter book!
And if that's not enough reading, there is also the VMware vCenter Update Manager Administration Guide, VMware vCenter Converter Administration Guide (PDF), Setup for Microsoft Cluster Service, Remote Command-Line Interface Installation and Reference Guide, VMware Infrastructure Management Assistant Administrator's and Developer's Guide, SAN System Design and Deployment Guide and the Guest Operating System Installation Guide. Vol II is another 7 free chapters!
And where the product documentation is lacking, there are numerous white papers, best practices guides, getting started guides, information guides, technical guides, performance studies, technical notes, collaborative documents written with business partners, and much much more to fill in the gaps.
Googling filetype:pdf site:vmware.com currently returns over 2,500 documents! Drop whatever you are interested in along with that search, and chances are very good that you will find something worthwhile to read.
If you still can't find what you are looking for, then head over to VMTN and ask there!