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 [...]

Does the number of links from a page make a difference?
The total number of outbound links from a page makes a huge difference in the amount of PageRank transferred to each receiving page. A Web page with ten outbound links sends one tenth of the total available flow to the receiving page. A page linking [...]

1. Google interprets a link from page A to page B as a vote, by page A, for page B. Google looks not only at the sheer volume of votes; among 100 other aspects it also analyzes the page that casts the vote. However, these aspects don’t count, when PageRank is calculated.
2. PageRank is based [...]

One of the easiest was to start building links is to submit your site to leading general web directories and directories in your niche. Don’t just think of directories as being places that accept websites. Some of the best directories represent business partnerships and exist on sites like manufacturers you sell for, local government sites, [...]

You can view how much Google’s estimate of keyword value using this tool:
https://adwords.google.com/select/TrafficEstimatorSandbox
Here is the estimated value for credit cards:
https://adwords.google.com/select/TrafficEstimatorSandbox?save=save&keywords=credit%20cards&currency=USD&language=en
Enter some of your keywords here and see what Google thinks they are worth:
https://adwords.google.com/select/TrafficEstimatorSandbox

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 [...]