Microsoft Windows Server 2003 Deployment Kit: A Microsoft Resource Kit

Rating:
Summary: Excellent value!
Review: Very in depth - covers multiple subjects and has pleanty of examples and frameworks to help you with your migration.

Also does an excellent job stressing the need to pilot and test - with one volume dedicated to setting up a test environment and using it to plan your deployment.

If you are looking at Windows Server 2003, rolling out Active Directory or just managing a windows environment I highly recommend this referece set.