Windows Server Folder Replication
Robocopy is probably the best choice for a simple copy.
robocopy src dst /mir
You could use Distributed File System, but it's probably overkill.
We just use Robocopy + batch file + scheduled tasks to copy this from 1 server to 3 others. Robocopy is available for Server 2003 as part of the Resource Kit tools, or built-in to Server 2008.