I would HIGHLY recommend the following:

http://www.euroanesthesia.org/pages/education/rc_vienna/13rc3.HTM
Use of Vasopressors in Cardiopulmonary Resuscitation, Karl H. Lindner, Anette C. Krismer, Volker Wenzel, Wolfgang G. Voelckel; Department of Anaesthesia and Intensive Care Medicine, Leopold-Franzens-University, Innsbruck, Austria. This is nice comprehensive overview (done by the folks doing the large multi-center study in Europe).

http://journal.med.edu/v.4_n.1/7/v41hollin.htm
Vasopressin: Could it be Life Saving in Patients Suffering a Cardiac Arrest? an overview article by Chester B. Hollinger, MD, Dept. of Critical Care Medicine, St. Francis Medical Center, Pittsburgh, PA. A medical director weighs in on whether or not to use vasopressin.

http://www.swemsed.com/Instructors/vasopressin.html
This site is a page on an Arizona website that provides an overview of vasopressin for their ACLS instructors. Nice overview

www.caep.ca/cjem2000/175.html (scroll down to Abstract #023)
Evaluation of the Myocardial Ischemia Subgroup in the Vasopressin Epinephrine Cardiac Arrest (VECA) Trial. Stiell IG, Hebert P, Wells G, Clement C, Vandemheen K, Tang A, Higginson L, Dreyer J, Weitzman B. Clinical Epidemiology Unit, University of Ottawa, Ottawa. Canadian journal of Medicine Vol. 2, No 3, July / juillet 2000. This review is a study done within Canadian teaching hospitals where no significant difference was seen between epinephrine and vasopressin, in managing cardiac arrests occurring within the hospital.