The Best "Specialized" Search Engines & Directories

These topic specific search engines and directories provide links to sites that are related by subject.
It is a growing list of quality specialized search tools.
Search Engines for Kids
Search Engines for Students and Teachers
Abbreviations and Acronyms
Acronym Finder (about every subject) | Medi Lexicon
Arts
Academic Info: Arts | ADAM | ArtChive | Artcyclopedia | CultureFinder (US) | World Wide Arts Resources
Associations
ASAE: Gateway to Associations | IPL Associations on the Net | Scholarly Societies Project | Trade Association Forum
Astronomy
AstroWeb
Auctions
AuctionBeagle | AuctionWatch | BidFind | Internet Auction List | Seek123
Biology
BioLinks |
Blogs
Bloglines | Daypop | Technorati
Books
Allreaders.com book reviews | FictionSearch | BookFinder | isbn.nu
Business
Business.com | Business2.0 Webguide | CEO Express | Corporate Information | Hoovers Online |
Computer science
CiteSeer (ResearchIndex)
Cybercafes
Cybercafes.com | Cybercafe Search Engine
Economics
Inomics
Education
Academic Info: Education | Blue Web'n | Education World | Educator's Reference Desk | Google's University Search | PedagoNet | SearchEdu
Engineering
Internet Guide to Engineering, Mathematics and Computing (EEVL) | iCivilEngineer
Environmental
WebDirectory
Events and happenings
WhatsOnWhen
Games
GameDex
Genealogy
Cyndi's List | Family Tree Searcher | Genealogy Today
Government
FirstGov | SearchGov
Happenings: see Events and happenings
Health
9-11.com | Academic Info: Health | Applesforhealth | BIOME | Drug Index (Rxlist) | HealthFinder.gov | Mayo Clinic | MedExplorer | MedHunt | MedWeb | PubMed | U.S. National Library of Medicine
History
Labyrinth (Medieval Studies) | Perseus Digital Library
Humanities & Social Sciences
Academic Info: Humanities | Humbul Humanities Hub | Social Science Information Gateway (SOSIG)
Images
Amazing Picture Machine | Google Image Search | Image Finder | PicSearch | Public Health Image Library
Investing
TheScannery (public companies)
Internet
Internet Archive - Way Back Machine | Internet Guide
Invisible Web
BrightPlanet | CompletePlanet | InvisibleWeb
Law
Best Legal Portals and Sites
Lyrics
Lyrics Search Engine
Maps & GIS
MapQuest
Mathematics
Internet Mathematics Library | MathSearch
Medical Science: see Health
Movies
Internet Movie Database
Music
MusicSearch | Ultimate Band List (UBL)
Music Charts
Charts All Over the World - HitSearch
News
DayPop | Google News | Headlinespot | NewsCenter | NewsDirectory | NewsLink | NewsTrawler | World News Network
NewsGroups
Google Groups
Newspapers
NewsPaperLinks | World Newspapers
Patents & Intellectual Property
FreePatentsOnline.com
Licensable Technologies - BirchBob
U.S. Patent and Trademark Office (USPTO)
Philosophy
Guide to Philosophy on the Internet | Hippias
Phone numbers
PhoneNumbers
Public Records
Searchsystems.net
Questions
Ask Me Help Desk
Radio
PublicRadioFan.com | Radio-Locator
Science
Academic Info: Sciences | eNature | ISIHighlyCited.com | Office of Scientific and Technical Information (OSTI) | Scientific and Technical Information Network | Scirus
Shopping
SmartBargains
Social Sciences: see Humanities
Sounds
FindSounds
Speech
SpeechBot
Sports
Baseball Reference
Technology
CNET | Internet.com Search
Television
TV4all.com - World Wide Internet TV
Tickets (Concerts, Sports, Theater/Arts,..)
StubHub | TicketsNow
Universities
Google's University Search
Usenet
Google Groups
Web Archives
Internet Archive Wayback Machine
Webcams
123cam.com | EarthCam
Wheather
The Weather Channel
Wi-Fi (Wireless Fidelity) - Public Wireless LAN Access Points
Hotspot-Locations | Wi-Fi Alliance Zone Finder | WiFinder (Wi-Fi Hotspots)
White Pages
Best People Search tools
Yellow Pages
Best Business Search tools