Google Results are based on 4 major criteria
* Keyword Density
* Keyword prominence
* Page rank or back links
* Last, but the most important: Content

Keyword density
The density of keyword affects the ranking of your page. The higher the keyword density the higher is your rank so one should always include a 30-40 word paragraph containing key-word rich content, thus increasing the keyword density.

Keyword prominence
The keywords you have chosen should appear in title, Meta and H tags with some occurrence in the body also. So you should not define Google without putting the word Google in the body of the definition. This means H and P tags should go hand shaking with each other.

Page rank and back links
The more site links to your site better is the page rank of your site and more relevant your site is. Google also takes into consideration the words [or Anchor text] that appear in your back links
Code:
<A> Click Here</A> is less relevant than
<A> Example of Google</A>


Content
Some say that the Content of your site is the king, but for me it’s actually the crown which the webmaster wears if his site has the right content. Build the content and users will be interested just be reading it.

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MarketRaise Corp.
SEO Company Providing Internet Marketing & SEO Services

i also noticed that sometimes they also based on those site with lot of visitors... but of course its not possible if not because of its content...

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Pet Beds | No Bark Collars

keyword density goes in-hand with content; keyword density should be used for keeping a well balanced copy that works with your users without being too overly optimized that is hard to read.

search engines have never used keyword density, it's about Term Vectors.

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Internet Marketing Consultant and Pay Per Click Firm

Thanks for the tips. Google results is based on off-page and on-page factor. But content including "blogging"is still the most important factor.

SE's algos are totally depend on keyword relevancy. So, your website should have all relevancy factors. And by Content and Links, we can do that...

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SEO Jobs in India

Scratchjobs.com - An Ultimate Jobs Search Engine in India

these 4 things the only real big factors? or should you also concentrate on like image naming, alt tags, div class names, urls enz enz?

or are have these things to little influence?