Hyper-V How To: Plan-Deploy
Here are some links to help you as you begin planning to deploy Hyper-V:
Hyper-V Planning and Deployment Guide
Hyper-V RAM Calculator Spreadsheet
Webcast: Virtualization Capabilities of Windows Server 2008 (Level 100)
Hyper-V: Hardware Considerations
Hyper-V Solution Accelerators: Infrastructure Planning and Design -Windows Server Virtualization
Dell Solutions Guides for Microsoft Hyper-V