This past weekend we rolled a few fixes to the Knowledgebase as part of our continual maintenance of it, but we also added one new feature of note.
Product Release Notes are now searchable in the KB. To see this, navigate to kb.vmware.com, and enter the text "release notes" in the search field. Hit <enter> to perform the search, and when the results are back, click on the Product Documentation tab. Here's how it looks:
This image shows the results with just "release notes" as our search. To search for ESXi release notes, just add that to your search text (release notes ESXi).