The main purpose of this research study is to compare the safety, tolerability, and anti tumor activity of an investigational drug, ABI-007 versus Dacarbazine in patients with metastatic melanoma who have not previously received chemotherapy. ABI-007 is a new preparation of the active drug paclitaxel. It contains the same medication as the prescription chemotherapy drug Abraxane®. Abraxane® is approved by the FDA for the treatment of metastatic breast cancer after failure of combination chemotherapy for metastatic disease or relapse within 6 months of adjuvant chemotherapy. Dacarbazine is approved by the FDA for the treatment of melanoma. In this study, ABI-007 and Dacarbazine will be tested as therapy for people who have not yet had any cancer treatment for the diagnosis of metastatic melanoma.