From today’s San Francisco Chronicle, this article reviews some alternatives to search engine powerhouses Google and Yahoo, several of which you may have heard of and/or use now, such as clustering engine Vivisimo and Topix.net (which bills itself as “The Internet’s Largest News Site). But other suggested sites may be new to you and worth a try. These include Find.com, focused on sources for business research (in beta, and offering a range of search features that include Boolean operators, stemming, proximity and grouping) and the open source engine Modex (which was unavailable at the time of this posting).