Common mistakes when upgrading domains from Windows 2000 to Windows Server 2003

In my line of work, I talk to lots of people about the "hows" of upgrading to the latest and greatest technology. Consequently, I've referred many people to the link below which is a great source of tips and links to other information worth considering when upgrading your domain from Windows 2000 to Windows Server 2003. It's had a recent refresh, so I recommend a re-visit if your upgrade is pending. 

http://support.microsoft.com/Default.aspx?id=555040