One of the biggest resources of information for me personally always has been the VMworld Presentations. I usually download every single presentation and store them in a separate folder and index them and read most of them at least once and some of them multiple times. The VMworld 2009 Sessions are available for download and I recommend you start reading/listening/watching them.
There are three that I want to highlight this time:
- TA3220 VMware vStorage VMFS-3: Architectural Advances since ESX 3.0
- TA2963 ESXtop for Advanced Users
- TA1394 vSphere 4 Advanced Storage Log Analysis