One of the most interesting new databases to me is Smithsonian Global Sound for Libraries. This database contains streaming music from the Smithsonian's Folkways Recordings, which collects diverse, traditional musical forms from around the world. It also contains music from archives in Africa and Asia.
Music students and faculty will probably find a lot to use in the Classical Scores Library. This database contains over 45,000 scores. They include everything from individual instrumental parts to full orchestral arrangements. They are presented in an easy-to read format and can be printed.