Specialized search engines:

The best:

• Speciality Search Engines  Need to find a search engine that looks only for science, medical or legal news? This page lists search engines by specialty.  There is also a separate page for General News search engines. Part of Danny Sullivan's excellent Search Engine Watch 

The rest:

• FindLaw        Legal search tool
  
• Health A to Z          For finding health resources
  
• MoneySearch
  
• PC game Finder            Searching for that perfect game for your teenager? Want to try a demo for a new flight simulator.  Give this specialized seacrh engine a try

By geography:

• Localeyes        Search by geographic location
• Alba36   Regional and specialty search engines and directories with more than 2900 search engines by country.