whats the difference between Windows Storage Server and Windows Server 2003

I trying to find out what the differences between these to operating systems are: Windows Server 2003 Standard and Windows Storage Server 2003 Standard.  These are the areas I would especially like information about: Security without Active Directory, File sharing without AD, running applications on Storage server (anti-virus, backup, ...), and anything else you would like to volunteer.

Thanks in advance for your help.