Yes include your prior nursing positions. CV should have synopsis of positions held and include professional orgnaization memberships, honors, presentations and publications.
Resume Writing by Donna Cardillo RN--lots of advice:
http://www.dcardillo.com/articles.html
Resume versus CV: Which Is Right for You?
Resume Writing and Interview Tips for Nurses from Univ. of Pennsylvania:
updated 8/28/06
Job Search Prep: Resumes, Cover Letters & Interviews
See: Wondering why you can't get hired or promoted: Resume + Interview hints!