Some of the best resource sites:
  American Cancer Society
  ASCO Thyroid Site
  Cancer Consultants
  Cancer Net
  E-Medicine
  Mayo Clinic
  Medicine Net
  Medline Topics
  NCCN Guidelines
  NCI Booklet
  NCI Cancer Net (patient page)
  NCI Cancer Net (physician page)
  Up to Date on nodules

anatomy and images go here