Knol Search Toolkit is not working from 12 October 2011.
Knol search engine is an important facility for browsing knols. Therefore an author created a Google custom Knol Search Engine.
More authors may create such custom knol search engines and provide them through their knols. Also, it is beneficial if author provide a Knol search facility at the end of their article. More readers may search knol in that case for more information.