 The purpose of this study is to examine for changes in the bone scan after treating with zoledronic acid ZometaTM. This study is designed to show if intravenous IV bisphosphonates, which are infused by vein, such as pamidronate ArediaTM or zoledronic acid ZometaTM, cause changes in the result of bone scans in women with metastatic breast cancer. Both bone scans and the IV bisphosphonates are components of routine care of women with breast cancer that has spread to the bone. 