Kosmix
This specialized search engine scours more than 3.2 billion general web pages and divides its results into subcategories — the Health engine, for example, groups links under treatment, prevention, symptoms, clinical trials and others headings — for more efficient info-gathering. It's also built to deliver more relevant links, by pulling from the part of its index that makes the most sense (it doesn't bother with travel sites if the keyword is diabetes, for example). The specialized health search engine is the farthest along — it graduated from the alpha test phase to beta in February EM] but Kosmix has been busy adding new subject areas, including Finance, Travel and U.S. politics, and, most recently, video games.