How many of us know about the web scale discovery tools? Do we really need to know about it?
Find a little information about it and how it help researchers in efficient retrieval process and how librarians can help in facilitating such services

Following are the benefits of discovery tools:
It provides-

• Single Point of Entry to several resources
• Pre-harvested
• Centralized Index
• Vendor neutral
• Relevancy
• Robust Features
• Customizable

World wide majority of the universities are using the discovery tools. Few of them are :  Serials Solutions Summon ( It is being used at MDX Uni); 360 search; OCLCs WorldCat Local; ExLibris' Primo, Aleph, Metalib; VUfind; EBSCO Discovery Services (EDS)  
There are many open source resource discovery tools also available like:

• Blacklight
• LibraryFind
• Scriblio
• SOPAC
• VuFind

Commercial Indian products:

• Knimbus ( It is being used in Delhi University, JNU..)
• NLP Labs Pvt. Ltd.

If anybody is interested to setup discovery tool in their library needs to see its features just like does it provide:

• A centralized index—to the article level & full text
•  Harvested from many sources (not from Google scholar )
•  Integrated with full text delivery/ Something you license
•  NOT federated/brokered/broadcast search
•  Understands library's holdings/rights
•  Each vendor has agreements with several content suppliers. (Ask... How many ??) ; In addition to this harvest locally held material like catalog and IR.
• see the content coverage and agreement with publishers.
• Relevance ranking cannot be compared with Google page rank
• 
  
• Copied from miscellaneous sources

An article worth reading: www.ir.inflibnet.ac.in/dxml/bitstream/handle/1944/1697/31.pdf