...and for educational purposes and to see how far back some of this goes,

No endorsements needed to act as a safety pilot:
http://www.faa.gov/about/office_org/...991/Rizner.rtf

For the logging rules for safety pilots as SIC or as PIC:
http://www.faa.gov/about/office_org/...1993/Hicks.rtf

If you don't like old stuff, there's stuff from 2009 and 2010 dealing mostly with cross country scenarios (safety pilots may not log cross country time toward requirements) that restate some of the basic rules.