Google Custom Search has recieved a lot of attention since its release. One thing I discovered while developing an implementation at work was exactly how customisable it is. It isn’t clear from the simple examples, but some of the more advanced examples and the documentation show how it is possible to do facet-based navigation of search results, refinement based on lables and more.
The other interesting development is its integration with Google’s AJAX search APIs. This means that it is possible to deeply customize the search results display. It also means that advertisments won’t be displayed (which may or may not be a good thing, depending on the application).
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