The current version of the "Best practices for Endpoint Protection 11.0 on Microsoft Small Business Server" white paper is available from the following URL: http://www.symantec.com/connect/articles/symantec-endpoint-protection-110-windows-small-business-server-2003-best-practices-white-pa.

This paper can be found in the Documents folder of the SEP DVD (Best_Practices_SEP11.0.6.pdf). The localised DVDs contain updated localised versions of this document.  This latest release of the document does not limit itself to any particular version (SBS 2003, SBS 2008, and so on) but applies to all supported versions of Small Business Server.  Details on supported Operating Systems can be found in System requirements for Symantec Endpoint Protection and Symantec Network Access Control 11.0.6.

There is also an online walkthrough available which covers the key points of installation/migration:
http://eval.symantec.com/flashdemos/products/endpoint_protection_install/index.html