The papers in the 2010 "Clinical Ethics" number of the Journal of Medicine and Philosophy explore issues along La Frontera, the borders and boundaries of clinical ethics. The first three papers in this "Clinical Ethics" number of the Journal explore borders and boundaries drawn within clinical ethics, concerning the moral standing of complementary and alternative medicine, palliative sedation, and induced abortion and feticide. The fourth and fifth papers explore the borders and boundaries between research ethics and clinical ethics.