Metasearch company Mamma.com has introduced Health Search, offering real-time search of some of the most authoritative sources of health information on the web. Results for many queries are categorized by topic (including definition, about, symptoms, causes, treatment, FAQ, news, help lines (when applicable) and a metasearch section. In many cases, a "second opinion" link offers an alternative source of information. The press release announcing Mamma Health Search has more information.
Mamma is claiming that the new service "conquers deep web," a boast a lot of companies have been making lately. I plan to take a closer look at Mamma Health and these other "deep web" resources soon, testing them on their own merits as well as determining whether they're really getting at true deep web content—or not. Stay tuned.