The Board of Directors is a great palce to target. A thread with names and phone numbers is here:
http://www.freerepublic.com/focus/f-news/1216569/posts?page=6#6
According to the Viacom Board of Director guidelines the Board has a fiduciary responsibility to the stockholders not Dan Rather.
http://www.viacom.com/pdf/CorpGovGuidelines.pdf
"The responsibility of the directors is to act in good faith and with due care so as to exercise their business judgment on an informed basis in what they reasonably and honestly believe to be in the best interests of Viacom and its stockholders."