To get an idea of how search engines work and the differences between them, check out: Search Engine Watch

List-Based WWW Catalogs

Excite

ITools

Info-Base International

Lifestyle UK

SearchLite (parent/child friendly search engine)

Web Search

Yahoo

Spider-Based WWW Catalogs

about

Alta Vista

Canada.com (Canadian Sites)

Fast Search

Google

HotBot

Jump City

Link Centre

Lycos

Netscape Search

Open Text

Scrub the Web

Search King

The Net1

Web Search 2K (A family-friendly Search Engine)

Web Crawler

What-U-Seek

Where 2 Go

Meta-Search Engines (they use several engines at a time)

800Go

Copernic99

C4.com

IXquick

DogPile

Family Friendly Search

Gimenei

Go Hip

Highway 61

Infogrid

Ithaki

Freality

thebighub.com

KartOO

search.langenberg.com

Mamma

MetaBug

MetaCrawler

Meceoo

OneSeek

Profusion

Proteus

Search.com

Surfy

Surfwax

Vivisimo

Web Taxi

World Curry Guide

37.com

Directories of Search Engines

All Search Engines

One Page Multisearch

Proteus

Queryster