VMware KB video showing patching of ESX Host. vSphere 4 Update Manager in action.

If you never used VMware vSphere 4 update manager before, this video shows you how to get started and how to successfully apply a necessary security patches to your ESX host.
The GUI interface seems to be difficult to understand, but hopefully with this video you’ll be able to find your way around. A terms like schedule patches definitions download, baselines, remediation,  ESX hosts, scan of ESX host,  maintenance mode will be shown. It’s an easy step-by-step video you can follow if you’re new to VMware and managing Virtual Infrastructure with VMware vSphere 4.
Popout

This video details installing patches or updates to your VMware ESX host using VMware vCenter Update Manager. This video was created using ESX 4.0 and Update Manager 4.0. The same basic steps apply to other versions of ESX. This video also shows you how to determine how often your host checks for patches or updates, where to schedule the task, and how to run the task manually.

Source: VMware KB