Looking for Bill Gates? Not the software billionaire but Billy Gates you met at the restaurant last week? Google is fine if you're looking for well-known captains of industry, millionaire athletes, or stars in rehab but what if you're searching...

Vertical search, as the name suggests, refers to search engines which focus on a specific industry or topic. Examples of vertical search engines include Kosmix, Healthline and Spock a "person" search engine which allows you to keyword-search your neighbor (the...