Google is rolling out a new version of Custom Search Business Edition, its hosted site search service for businesses, adding improved indexing and a new name.

The service will now be called Google Site Search and offer a more comprehensive indexing capability and more granular options for ranking search results.

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The goal of the service remains unchanged: to provide web publishers with a Google-powered search engine for their public sites. "Over the last five years, site [owners] have invested a lot on site optimisation and navigation and graphics, but not so much on search," said Matthew Glotzbach [cq], director of product management for Google Enterprise.

One of the product's new features is enhanced index coverage, which is an index specifically focused on a customer's site and designed to complement the site's pages that are already included in Google's web index.

In addition, the product now gives site owners more options to affect how search results are ranked and listed. For example, the service can be configured to assign more weight to a document's age, so that recent pages are favoured over older ones, something Google calls 'date biasing'. On the other hand, site owners also can 'bias' search results towards pages from certain sections, like a product catalogue.

Another new feature of Google Site Search lets site owners add a custom synonym dictionary, so that search results include not only documents containing the query's keywords, but their synonyms as well. Also, the product allows for more customisation of its look and feel than before, so that its search and result pages can be made to resemble the site's style.

Pricing for this hosted service starts at $100 (£50) per year for sites with 5,000 pages. The cost for sites between 100,001 and 300,000 pages is $2,250. If a site has more than 300,000 pages, site owners need to contact Google's direct sales team for prices.

Google has other site search services – such as Custom Search Engine AdSense for Search, a free hosted service that isn't as sophisticated as Google Site Search and requires that site owners carry ads provided by Google. It also has its Mini and Search Appliance products, which are computers loaded with search engine software that can index both a company's publicly-available web pages as well as internal files and documents with access restrictions.