Bone Workshops Davos 2006. Abstracts from the workshops: Frontiers of Skeletal Biology and What is New in Bisphosphonates?; the Eleventh and Valedictory Workshop on Cell Biology of Bone and Cartilage in Health and Disease; and the Eighth and Valedictory Workshop on Bisphosphonates –From the Laboratory to the Patient. Davos, Switzerland. March 2006.