These are links to material relevant to consolidating and upgrading SQL Server. 

SQL Server Consolidation on the 64-Bit Platform - Lessons Learned

Pre-deployment IO Best Practices

Six Failover Clustering Benefits Realized from Migrating to SQL Server 2008 - Top 10 Lists

Microsoft SQL Server 2000 Scalability Project-Server Consolidation

Planning for Consolidation with Microsoft SQL Server 2000

SQL Server Consolidation on the 32-Bit Platform using a Clustered Environment

SQL Server Consolidation on the 64-Bit Platform

Report to Congress on Server & Data Center Energy Efficiency (Public Law 109-431)

Windows Server 2008 Multi-Site Clustering                           

Microsoft Product Lifecycle Search

Dell Smart Energy Calculator

Planning for Energy Requirements with Dell Servers, Storage, and Networking

SQL Server 2005 Upgrade Technical Reference Guide

SQL Server 2008 Version and Edition Upgrades

The What, Why, and How of Master Data Management

Scale-out Querying with Analysis Services

Scale-Out Querying with Analysis Services Using SAN Snapshots

Reporting Services Scale-Out Architecture

Introducing the SQL Server 2008 Data Collector

Microsoft Operations Framework 4.0