In recent years, a suite of applications have been developed to accompany the traditional Integrated Library System (ILS) in enabling libraries to manage and provide access to information. These applications include metasearching and portal software; resolvers using the OpenURL syntax for context-sensitive linking; digital asset management; and electronic resource management (ERM) systems.1 Lorcan Dempsey adds to this list, pointing to tools such as personal bibliographic and reading list software.2 With this proliferation of systems of which the ILS is only a part, libraries face the issues of data standards and application integration. This chapter will explore these issues. The first part will look at the various standards in place for accessing and managing e-resources. The second part will focus on the integration of library applications and, in particular, the hopes invested in Web services technology.