The most popular search engines:

Ah-ha
Alta Vista
WebCrawler
HotBot
Lycos
Infoseek
Excite
Image Surfer
DejaNews
Yahoo!
More...

Simultaneous search services:

Metafind
Metasearch

Extensive list of additional search engines:
(Note:  not all sites have been reviewed by the ldsToday staff)

Aesir Custom Search - Customize your favorite search engine with output filters.
Ahoy! - The Homepage Finder
Airport Search Engine - ASE database contains airport- codes and a list of links to airport pages on the web.
Alcanseek - comprehensive searchable database and directory featuring solely Alaskan and Canadian web sites.
ALIWEB
ALIWEB Format
ALIWEB Mirror [Australia]
ALIWEB Mirror [Indiana, USA]
ALIWEB Mirror [Munich, Germany]
ALIWEB Mirror [Singapore - nus.sg]
ALIWEB Mirror [Singapore - singet.com.sg]
Alku - provides links to Finnish web-sites as well as a brief glossary and guide on the internet. In Finnish.
AltaVista - web and newsgroup search engine.
AltaVista Australia - mirror site providing Australian, New Zealand, and Pacific Rim users with faster access.
AltaVista Europe - mirror site offering a variety of countries to connect to and languages to choose from.
Ananzi - search engine dedicated to the South African domain.
AnySearch - Korean search engine.
Anzwers
Aqueous - dedicated to sites that have water related content.
Area 52 - Macintosh, Amiga, OS/2 searchs a specialty.
Arkansas Direct - search engine serving the state.
Astalavista - daily updated search engine monitoring hundreds sites with hack & crack stuff.
Aviation Search Engine from Totavia
BabyOIL - resource discovery system
BizAds Business Locator - search engine dedicated to business listings.
Black Widow Search
Brian's Emulation Search Engine - similar to Yahoo! or Altavista.
BRS Search Page - search for information, jobs, people and more.
Business Seek
Campsearch - global directory of summer camps and outdoor programs for kids, teens, and adults. Find a camp based on geographic location and camper requirements.
CasePoint WebServer
Cinemachine - brought to you by Addicted to Noise.
Claymont.com - C
Community-based Navigation - We are testing an enhanced version of Mosaic that supports fast Likert scale rating and automatically pools item-ratings in a community server that can recommend and evaluate URLs.
Company Site Locator - The tool for searching for companies' websites when you don't know the exact URL address.
Content Router
Crosslinkz
Discovery Channel Online Search Engine
Dynamic Site Search
El Faro - (Spanish search)
Electric Monk - allows users to perform natural language web searches in plain English.
Euroseek
excite
Fido the Shopping Doggie
Fiji Search Engine
Filez  - search page with an index of over 60 million files and all the popular corporate and shareware sites.
Fish-Search
Funny Site - search engine for humor sites.
G-Spot - Philipine search engine.
Global Online Directory - search engine with unique search facilities and free classified ads.
Globe Page - Asia search service in English, Chinese GB, and Big 5 encoding.
GlOSS - database for text
Google
GoTo - top-down and bottom-up internet search engine with top 100 search term lists, best of the web editor's picks, and in-context, attribute tagged search results.
Heuréka - search engine for the Hungarian Webspace.
Home Team - Search for pages or names, multiple source searches, limited searches, batch e-mails, submits to multiple search engine sites!
Hong Kong Search Engine
HotBot
HumanSearch - search the web using real humans.
Identify - Search the web using IDML.
In 2 Ireland - search resource with meta search and a multi submit engine.
Inference Find
Infohiway
Informant Server, The
InfoSeek
InfoZona - state-specific searchable database of links.
Internet Rank Engine - searches web and ranks output according to each site's quality in relationship to the query.
Irena - Web Connections Finder
Italian Spider
IWEB Search Service - This search engine periodically polls the hotlists and annotations of registered users. It performs searches on this database for relevant links.
James Kirk Search Engine - looks specifically for Star Trek sites.
Johnes - a search engine for European users.
keyword.com
Lokace
Lycos - develops and provides online guides to locate and filter information on the Internet.
MathSearch - search a collection of mathematical Web material
Matilda
Mojoe
Money$earch - geared towards small business owners and on-line investors in the financial markets. All sites are reviewed and described on-line.
Montana Pathfinder
MOSHIx2 - Japanese and English search engine.
MRO-Explorer - industrial search engine to locate distributors, manufacturers, and related subjects.
MusicSearch - music search engine with over 5,000 links.
Netword - a word or short phrase that provides free access to an Internet destination.
News Hunt - links to free newspaper archives and a searchable database of searchable newspapers.
Next Crawler - search engine that references Greek sites.
Nordic Web Index
OneKey
Open Text Web Index
PlanetSearch
Poke! - search assistant that uses javascript and frames. It is always with you, an alt + tab away.
Pollinia: Network Orchid Stuff
Pregnancy and Parenting Search Engine - a search engine devoted to pregnancy and parenting related web sites. Categories include a range of topics relating to pregnancy, parenting, and family issues.
Prospernet, Inc.
Public Safety Search Engine
Radar
RBSE's URL database
Re:Search Centre
Scrub The Web
Sea Crawler - search engine for Seattle web sites.
Search Argos - search for web sites and documents that cover the ancient world.
Search King
Search NZ
Search.bg
Search.NL
SemioMap
Sesna - Ukrainian Search
Simmany
SiteFinder
Snoopie
Spider's Apprentice, The 
Study Web - comprehensive searchable categorized index with reviews of over 17,000 educational and reference Web sites. Great for students and educators alike.
Super Snooper - for kids and adults who prefer not to be presented with obscenity, hatred, drug-promotion or bigotry on the internet.
Surfer's Edge
Swiss Search
TechnoFind
TheLinks
Thunderstone
Travel-Finder Spider
Ugabula .
Verity Internet Virtual Library Search
Wakano
Web Tour
WebDirect!
Webindex
Webseek
Websurfer
What-U-Seek
whoizzy
World Access Internet Navigator
Yam Web Navigator@
Zebra - search South Africa.
ZenSearch