Best Way To Configure Mapped Drives?

We have a Windows 2003 server that contains files that need to be accessed by a collection of XP Pro clients. We initially set up mapped drives that connected these client computers to the server using a set of security credentials that matched user accounts on the server. These mapped drives "map" when the client logs into XP. Since the local login credentials on the client PCs don't match those on the server, we use "Connect using a different username" to use credentials residing in the Server userbase.