I wanted to point you in the direction of a document that helps with moving from Remote Installation Services (RIS) to Windows Deployment Services (WDS) on Windows Server 2003.

Many of the clients that I consult for are big RIS users, so this whitepaper has been especially useful in recent months as they have moved to deploying Windows Vista...

You can download it from the link below:

Deploying and Managing the Windows Deployment Services Update on Windows Server 2003