Google is by far the most researched upon Search Engine in the world basically because it is the one most used by people.
Yahoo on the other hand is a combination search engine and search index to information on the World Wide Web.
MSN is Microsoft's own search engine.
There are millions of web entrepreneurs in the world. All these web entrepreneurs want to get a piece of the Big 3 search engines. There are many ways to get a slice of it. People have been to Search Engine Optimization forums and Webmaster Forums learn these great techniques and strategies to get the goal of being the #1 rank for a certain keyword and that high Page Rank.
I have listed here the best ways to promote a site:

1. Link Building - is the process of of creating inbound links to owns website. This can be done reciprocal links, being listed in e-zines, newsletters, directories, search engines, etc.

Link Building Techniques:

a. Submit articles to the industry leader's website.
b. Get a press release. Make news about what is happening at your website.
c. Submit your site to paid directories.
d. Submit your site to DMOZ and other free directories that allow free submissions. Free submissions is one of the best free things to do.
e. Create a great article on your site and let it be submitted to Digg. Chances are, that people will see it and link to the article.
f. Post your site at craiglist. Ugly doesn't mean worthless. Craiglist is one great way to get people to know your site.
g. Answer questions on Yahoo Answers. Give your site reference if it is really from your site.
h. Online Forums allow members to leave links in their signatures. Make good contributions to the forum and people will recognize you as an authority in the particular field. People will try to link you.
i. Blogs have been a popular trend lately. Make blogs. Become and authority in your field. Put in a link and I am sure that people will click the link and link to your site.
j. Freebies. Everyone likes freebies. It is human nature that people want something that they ddn't pay for.

Search Engine Optimization - is defineed as the altering of a website so tha it can do well when crawled by in search engines.

2. Search Engine Optimization Techniques

a. Title. The title of the website or page gives away a very big information about the site. Make sure that you give a title that is very descriptive of the content of the site.
b. Fresh Unique Content. Just think of it like this. If a web page has the same old information, there is no reason to crawl it again. Always have fresh content and that will make sure that your site will always be crawled.
c. Create a sitemap. Sitemaps is a map to your site. A sitemap should contain links to every page of your site . The important thing about a sitemap is that it will ensure that all pages will be crawled because it is link to a page that is being crawled. A crawler cannot crawl something it does not know about.
d. Don't use duplicate content. If pages have the same content, it loses the reason why it should be crawled again. Make sure that every page doesn't have a similar content with another page.
e. Make sure you use the tags intelligently. Make use of , tags, and on very important keywords that you want to use. Make use of your links in the best way. Try using:

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There are more ways to increase your site rank. I will keep you posted for anymore.