What Is Page Rank?
PR is important because it determines your blog or website ranking in the Google search results. Although PR is not the only component that Google take into consideration to rank pages in the search results, but it is definitely an important factor.
Links into your website cannot harm your PR because webmasters are unable to control the link from outside. However, links from yours to the other website can be controlled and so if the particular website is abusing the system, your outlink to them can cause some damages to your PR. Therefore, be very careful with the link that are place on yout website to avoid being penalised by Google. Tools To Help Calculate PR
Tools To Help Calculate PR
You can install the Google Toolbar on your browser and you will be able to view every single page rank on your browser.