Search functionality specific to one site.
Site search can make or break the user experience. Great search results can help win long-time visitors. Poor search results (“no records found” or “every record found”) risk losing visitors forever.
Search tools are often divided into two categories; software that runs on your servers and hosted services that run on remote servers. Small sites may benefit from a free site search engine service, although the low cost may come at the expense of 3rd-party advertisements with the search results. Enterprise sites may need to buy more customizable solutions, which often run several thousand dollars or more, depending on volume.
see also: SEO Tools
site search engine
More Fundamentals for a Quality Search
ClickZ (January 25, 2001)
The Fundamentals of Quality Search
ClickZ (January 18, 2001)
Search and You May Find
useit.com – Alertbox (July 15, 1997)
What is a Web Site Search Tool And Why Would I Want One?