Here is the persistent link to the article Nicole recommended.
http://search.ebscohost.com/login.aspx?direct=true&db=a2h&AN=57161083&site=ehost-live
from Abstract... web scale discovery services for the library environment have the capacity to more easily connect researchers with the library's vast information repository. This includes locally held and hosted content, such as physical holdings, digital collections, and local institutional repositories. Perhaps more significantly, web scale discovery also accesses a huge array of remotely hosted content, often purchased or licensed by the library, such as publisher and aggregator content for tens of thousands of full-text journals, additional content from abstracting and indexing resources, and content from open access repositories.