Tom Finnis, Technical Operations Manager for Help4IT, has recently written some excellent articles on VMware vSphere and ESX over at the Petri IT Knowledgebase.
Here are some of the VMware-related articles that he wrote:
Also, check out the VMware vSphere Training from Train Signal! This new course covers VMware ESX Server and the replacement for the VMware Virtual Infrastructure Suite – vSphere.
Also, did you know that VMware ESXi is FREE? You can register at VMware.com to obtain a FREE ESXi 4.0 download and license key for as many hosts as you would like.