Some related posts from Technorati and Google.

[Marketing Defined] Google Page Rank replaced by Trust Rank: Your views on the sudden demise of Google Page Rank or its disappearance, and any expert information on what is happening are welcome via the comments section .no theories, just facts please.

 [Link popularity check at Uptimebot] Useful Resources and Tips for Webmasters: Before creating a site - see your potential opponents sites’ Page Rank here http://www.seo-guy.com/seo-tools/google-pr.php or here http://www.prsearch.net/ - just type in a keyword and enjoy.

[Marketing Defined] Increase website traffic expert SEO tips: The news in SEO circles is that Google will not apply any weight to new back links to a website, until these links have been in place for a few months .which does defeat the purpose of purchasing expensive links, as they will not add any value to your Page Rank until they are suitably "aged".

[Blog.logicalsense.ca] March 2005 Search Engine Optimization Blog Archive: If on-page SEO impacts your rankings equally to your backlinks and content, the relevancy of a website should be quite high whereis if your backlinks have the greatest impact on your rankings, your link relevancy might be higher, but your site relevancy won't.

[Searchenginegenie.com] SEO BLOG: An other possible reason is the site is banned from the search engines for any particular onpage factor, In that case search engines periodically checks to see whether the onpage spam tactics is removed and as soon as they see the spam being removed they might reinclude the site into the index, So for people who are complaining that their site was previously indexed and listed in google but suddenly it disappeared from the index and googlebot keeps visiting the site it is good to look at your onpage work and see if there is any spam tactics like hidden text, cloaking, keyword stuffing etc,

Reflected tags on Technorati: Blog, SEO, SEO Files