PageRank is a numeric value that represents how important a page is on the web. Google figures that when one page links to another page, it is effectively casting a vote for the other page. The more votes that are cast for a page, the more important the page must be. Also, the importance of [...]

Latent semantic indexing is the science of natural language processing. LSI analyzes relationships between words and is designed to distinguish naturally written text from keyword-stuffed documents. Latent semantic indexing considers natural and synonymous relationship between words.
For example, if you’re examining an article about an airplane, LSI will look for synonyms: aircraft, plane, aero plane. It [...]

This is a list of Major Web Directories and reviewed web guides. Web Directories
Business.com charges a $299 annual listing fee. Business.com is a purchase more for direct traffic than link popularity.
DMOZ - also known as the Open Directory Project - provides free listings, but it may take a while to get your site listed.
Gimpsy verb [...]

Bob Mutch recently rated 40 top directories based on their age, how many edu and gov links they have and whether or not they are listed in DMOZ and Yahoo!. I would contest that WhatUSeek isn’t a real directory, ISEDB is a directory of search engines and directories, and that Vlib.org should be counted as [...]

By content/topic

General

Alexa Internet
Ask.com (formerly Ask Jeeves)
Baidu (Chinese)
Cuil
Exalead (French)
Gigablast
Google
Live Search (formerly MSN Search)
Sogou (Chinese)
Sohu (Chinese)
Wikia Search
Yahoo! Search

Geographical limited scope

Accoona, China/US
Alleba, Philippines
Ansearch, Australia/US/UK/NZ
Araby, Middle East
Baidu, China
Daum, Korea
Guruji.com, India
Goo (search engine), Japan
Leit.is, Iceland
Miner.hu, Hungary
Najdi.si, Slovenia
Naver, Korea
Onkosh, Middle East
Rambler, Russia
Rediff, India
SAPO, Portugal
Search.ch, Switzerland
Sesam, Norway, Sweden
Walla!, Israel
Yandex, Russia
ZipLocal, Canada/US

Accountancy

IFACnet

Business

Business.com
implu
Nexis (Lexis Nexis)
Thomasnet (United States)

Enterprise

See also: Enterprise search

AskMeNow: S3 - Semantic Search [...]

Your Own Customer Base
By setting a newsletter or sending automatic period announcements via email to your own customers, you increase the probability of repeat business. They’ve already bought from you, so they are very willing to buy your product or service again. You have to make sure you get their permission to send them those [...]

Hiding text or links in your content can cause your site to be perceived as untrustworthy since it presents information to search engines differently than to visitors. Text (such as excessive keywords) can be hidden in several ways, including:
* Using white text on a white background
* Including text behind an image
* Using CSS to hide [...]

Cloaking
Cloaking refers to the practice of presenting different content or URLs to users and search engines. Serving up different results based on user agent may cause your site to be perceived as deceptive and removed from the Google index.
Some examples of cloaking include:
* Serving a page of HTML text to search engines, while showing a [...]

Webmaster Guidelines
Following these guidelines will help Google find, index, and rank your site. Even if you choose not to implement any of these suggestions, we strongly encourage you to pay very close attention to the “Quality Guidelines,” which outline some of the illicit practices that may lead to a site being removed entirely from the [...]

302 Redirects
The “302″ refers to the HTTP status codes that are returned to your browser when you request a page. For example, a 404 page is called a “404″ because web servers return a status code of 404 to indicate that a requested page wasn’t found. The difference between a 301 and a 302 is [...]