The document is called Virtual Desktop Infrastructure - A Guide to Implementation Best Practices and is about 30 pages long. It has been written by a VMware VAR called Long View Systems. Contrary to what you might think, this document hasn't got a single reference to VDM (2) meaning that the wisdom shared in this document can be applied to all VDI products that work with Vi 3(.5) for example Citrix XenDesktop, Provision Networks VAS, Ericom Powerterm WebConnect etc.

This white paper addresses the challenges involved in designing and deploying, managing and scaling a Virtual Desktop Infrastructure (VDI) solution. The paper is designed to act as a practical guide to solving both business and technical challenges that you will face when deploying VMware Virtual Infrastructure to provide desktops to users. This paper assumes that the you are familiar with the concepts of a VMware virtual infrastructure – namely Virtual Center and the ESX Server hypervisor concepts.

It talks about all the important subject and is not afraid to talk about the limitations of VDI:

• Graphically Intense Applications
• Offline Use
• Local Devices Support
• TCO and ROI
• Printing
• Windows Licensing
• Application Lifecycle Management
• Storage Requirements

A must read as far as I'm concerned. Be sure to read Virtual Desktop Infrastructure - A Guide to Implementation Best Practices.