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Standard Edition

Windows Server 2003, Standard Edition is aimed towards small to medium sized businesses. Standard Edition supports file and printer sharing, offers secure Internet connectivity, and allows centralized desktop application deployment. This edition of Windows will run on up to 4 processors with up to 4 GB RAM. 64-bit versions are also available for the x86-64 architecture (AMD64 and Intel64, called collectively x64 by Microsoft). The 64-bit version of Windows Server 2003, Standard Edition is capable of addressing up to 32 GB of RAM and it also supports Non-Uniform Memory Access (NUMA), something the 32-bit version does not do.

[edit] Enterprise Edition

Windows Server 2003, Enterprise Edition is aimed towards medium to large businesses. It is a full-function server operating system that supports up to eight processors and provides enterprise-class features such as eight-node clustering using Microsoft Cluster Server (MSCS) software and support for up to 32 GB of memory with addition of the PAE parameter in the initialization file. Enterprise Edition also comes in 64-bit versions for the Itanium and x64 architectures. The 64-bit version of Windows Server 2003, Enterprise Edition [64-bit] is capable of addressing up to 1 Terabyte (1024 GB) of RAM. Both 32-bit and 64-bit versions support Non-Uniform Memory Access (NUMA). It also provides the ability to hot-add supported hardware.

http://en.wikipedia.org/wiki/Windows_Server_2003