Yahoo Story
Yahoo is a website cum search engine and is popular due to its provided services of searching. Yahoo has some different strategies than Google and Msn. But all of them have many thing common as:
1. All search engines are against spamming.
2. All of them give importance to the human touch as they provide better and related searches only.
3. All give users and visitors as top priority.

What new in Yahoo
I have noticed that Yahoo is rolling out a brand new search engine, with its own index and ranking mechanisms, casting aside its long-standing use of Google-powered search results. The move is bound to roil the industry and sets in motion a new race for the claim of web search champion.

Msn search engine optimization
As we all know that MSN is the third top search engine and as according to their site owner help section - they mix and develop keywords with the help of their MSNbot from the website provided content and very often from meta tags - keywords and descriptions provided. It means that MSN's web crawler MSNBot crawls your website; it analyzes the content on indexed web pages and generates keywords to associate with each page.

What is Google Web Accelerator?
Google Web Accelerator is an application that uses the power of Google's global computer network to make web pages load faster. Google Web Accelerator is easy to use; all you have to do is download and install it, and from then on many web pages will automatically load faster than before.

Nothing simple as Search engine optimization
Search engine optimization is to make website more search engine-friendly. This includes keyword selection, keyword usage, content generation and meta tag identification, among others.

What factors are responsible for a website's ranking?
The following factors are responsible for a website's ranking:

Content with good keywords
Number of your competitors
Continuous SEO process
Link Popularity and link building
Tweaking of website for improving SEO process
Regular monitoring of ranking and working on to improve rankings

How to increase link popularity in search engines.
You can also make posts in forums related to your industry to increase your link popularity. Just do a search on any search engine with your industry, forums or discussions and you should be able to find a few discussion boards where you can make posts.

Role of site content in search engine ranking
Real content for site is the most important thing for any website as this will help in good ranking as well as make site helpful for visitors. This will increase the chances that user remains more and more on site and visit it again. But if the same content is provided as the others have done then search engines may consider your site a mirror site and it will not help you in gaining your rankings.

What about keyword density on a page
Nothing saying as good but you must use one keyword only three to four time in a page. If you don't do as this then Search engine will throw your site out and you will never get a good page rank. To avoid this you must change keywords in each paragraph of page.