A good friend and fellow Microsoft Enthusiast, Onuora Amobi, has recently written a book about Windows 7 Deployment.
The purpose of the book is to help small businesses migrate from older versions of Windows to Windows 7. The book is well written and careful attention to detail is used throughout the book to ensure a pain-free, successful migration.
Chapter 2 includes information on the new features in Windows 7 that may factor in to your decision to upgrade, which is continued in Chapter 3 with a detailed analysis of the differences between the different versions of Windows 7.
Chapters 5 and 6 explain the migration process and lay out various methods to migrate.
Chapter 11 covers the real beauty of OS deployment using imaging.
This is a great book. If you run a small business or know someone who is planning to upgrade their systems, this book will certainly save time and money.
More information: The Windows 7 Small Business Deployment Guide