Using sitemaps has many benefits, not only easier navigation and better visibility by search engines. Sitemaps offer the opportunity to inform search engines immediately about any changes on your site. Of course, you cannot expect that search engines will rush right away to index your changed pages but certainly the changes will be indexed faster, compared to when you don’t have a sitemap.
Also, when you have a sitemap and submit it to the search engines, you rely less on external links that will bring search engines to your site. Sitemaps can even help with messy internal links – for instance if you by accident have broken internal links or orphaned pages that cannot be reached in other way (though there is no doubt that it is much better to fix your errors than rely on a sitemap).
If your site is new, or if you have a significant number of new (or recently updated pages), then using a sitemap can be vital to your success. Although you can still go without a sitemap, it is likely that soon sitemaps will become the standard way of submitting a site to search engines. Though it is certain that spiders will continue to index the Web and sitemaps will not make the standard crawling procedures obsolete, it is logical to say that the importance of sitemaps will continue to increase.
Sitemaps also help in classifying your site content, though search engines are by no means obliged to classify a page as belonging to a particular category or as matching a particular keyword only because you have told them so.
Having in mind that the sitemap programs of major search engines (and especially Google) are still in beta, using a sitemap might not generate huge advantages right away but as search engines improve their sitemap indexing algorithms, it is expected that more and more sites will be indexed fast via sitemaps.
PageRank is one of more than 100 factors Google uses in the ranking of you website and your resulting position on their search engine. You get PageRank (PR) by having backward links from other website pages that have a higher PR rating than your site page the link is to. The PR of your site is updated about once of month when Google updates their database of web pages.
For example if you have a backward link from a site that has a PR of 5, some of that PR be will transfered from their website to your website page they linked to. These links are called backlinks.Sites with high PageRank will get crawled by the search engine bots more often, and the crawls will be deeper.
While Google takes into consideration the PageRank of your site, high PR doesn’t always equate to a higher Search Engine Results Position (SERP). You can have high PR and have a low SERP on a certian keyword phrase, while some other site can have low PR but have a high SERP on the same keyword phrase.
In your pursue for a high PR keep in mind that numerous relevant keyword anchor texted backlinks will get you a higher SERP than just raw high PR and that with numerous relevant keyword anchor texted backlinks will come PR.
You aim shouldn’t be just for high PR, but for proper backlinks that will bring with them a higher PR.
The following will give you an idea of how many inbound links and what PR those inbound links need to be, for you to obtain the desired PageRank for your pages. The following pagerank algorithm equation is the relationship between two pages A and B, with the below example page A receiving an inbound link from page B.
PR-A = (0.15) + (0.85 x PR-B / TOL-B)
PR-A is the PageRank of Page A, PR-B is the PageRank of Page B, and TOL-B is the Total Outbound Links of Page B.
For example if you get a inbound link from a page that has a PR of 6 and on that page there is a total of 6 outbound links (counting the one to your page), a PR of 1 will be added to your page: 0.15 + (0.85 x 6/6) = 1. If that one inbound link adds a PR of 1 to your page, and you wanted a PR of 5 it would take 5 similar inbound links.
By similar I mean pages that have a PR/TOL ratio of 1. That could be a PR of 5 with 5 outbound links, or a PR of 7 with 7 out bound links and so on. A PR/TOL ratio of 1 will add to your page a PR of 1. Using the PR/TOL ratio simplifies the RageRank algorithm equation and makes it easier for you to evaulate what PR a inbound link will add to your page.
When you are looking for inbound links just divide the PR of the page by its outbound links and this will give you a general idea of the PR a inbound link from that page would give you.
SEO links:
http://www.101websitedesign.com/internet_marketing/seo/
http://www.google.com/support/webmasters/bin/answer.py?hl=en&answer=35291

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