Welcome to vSphere-land!

vSphere 4 Pricing, Packaging and Licensing Overview (VMware)
VMware vSphere 4 Licensing Guide (VMware)
VMware vSphere 4 Licensing Troubleshooting Guide (VMware)
VMware vSphere Licensing FAQs (VMware)
vSphere Editions Comparison (VMware)
vSphere Key Features & Benefits Summary (VMware)
vSphere 4 Essentials Editions (VMware)
vSphere - What’s New in Licensing (VMware)
vSphere Upgrade Entitlement Mapping (VMware)
vSphere Upgrade Center - Licensing (VMware)
License Server Configuration for vCenter Server 4.0 (VMware)
Licensing details from the vSphere launch event (Virtualization Pro)
VMware vSphere licensing commentary and FUD (Virtualization Pro)
The Plus in vSphere 4.0 Enterprise Plus licensing: Percolating thoughts (Virtualization Pro)
vSphere licensing & technology - Communities Roundtable podcast #44 (VMTN Blog)
vSphere Licensing Notables (Boche.net)
Breaking Down vSphere Pricing (Virtualization Review)
vSphere 4 – So What is new? (Technodrone)
vSphere Pricing Comparison (Technodrone)
License keys: Everything is about to get a whole lot better! (The VM Guy)
VMware vSphere General Availability (OZ VMs)
vSphere Pricing and Licensing (OZ VMs)
VMware vSphere 4: What’s in Enterprise Plus? (Virtual Future)
Quick Guide to vSphere License Portal (Latoga Labs)
vSphere Licensing Explained (VM Hero)
Some Basics of Microsoft Server OS Licensing on VMware vSphere (TechHead)
Smarter Microsoft licensing can reduce VMware environment costs (SearchVMware)
Comparison of product offerings for vSphere 4.0 and VMware Infrastructure 3.X (KB Article)
Licensing ESX 4.0, ESXi 4.0, and vCenter 4.0 (KB Article)
Split and Combine license keys on vSphere (KB Article)
Enabling license downgrade by disabling features (KB Article)
Downgrading vSphere 4.0 License to ESX 3.5 version (KB Article)
Comparison of product offerings for vSphere 4.0 and VMware Infrastructure 3.X (KB Article)

VMware licensing page
Server-based License File Checker
Pricing, Packaging & Licensing Overview
Understanding VI3 Licensing: Server and Host-based licensing models
Overview of Microsoft Licensing for Virtualization
Windows Server Virtualization Calculator
Licensing Microsoft Server Products with Virtual Machine Technologies
Microsoft Virtualization Licensing and Distribution Terms
Addendum to Microsoft Virtualization Licensing and Distribution Terms
Licensing Microsoft Server Products with Virtual Machine Technologies
Difference between a License Administrator and Support Administrator
How to combine FlexLM License Files
Changes in licensing for VI3 Standard Edition When upgrading to VI 3.5
Updates to your VMware VI3 Starter Licenses
How to License Microsoft’s Products (VMworld 2007)
VMware Multi-core Pricing & Licensing Policy
VMware Single Processor Licensing Policy
Microsoft Licensing FAQ
Installing ESX Server Licenses
Not enough licenses installed
Support policy for Microsoft software running in non-Microsoft hardware virtualization software
SVVP - how does it work?