For a long time, cisco.com's search engine functionality was, let's say, less than optimal. Many people (myself included) opted to use Google instead, appending
site:cisco.com to a query to locate relevant official content. Fortunately, Cisco recently unveiled a completely revamped and much more useful search engine.
Search results tend to be much more accurate than they were in the past, and the engine provides the convenient ability of filtering results to a specific document type (for example, to view only configuration guides or command references). One can also filter by product, product group, task, or site area, and subcategories under each heading allow for even more discretion.
Since the new search engine is so handy, I decided to include it in Firefox among Google and Wikipedia. You can too, by installing this OpenSearch plugin (right-click, save to your Firefox search plugins directory).