Yippi, the metasearch engine
Yippy is a metasearch engine: it queries multiple search engines and combines the results to be displayed as a group, or cloud, on one screen.
The benefits of using this search engine is that it gives you a good and quick overview of your search results, and encourages the users to continue browsing. The difference between a search engine like Yippi and for example Google is that by continuing browsing can allow the user to discover information he/she initially was not looking for. For Google, you more or less know what you are looking for, and Google most often gives you an answer to your query without necessarily promoting additional discovery.
That is why (business) taxonomies are good. It stimulates further discovery.