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Some related posts from Technorati and Google.

[Matt Cutts: Gadgets, Google, and SEO] PageRank sculpting: No PageRank would ever escape from the loop, and as incoming PageRank continued to flow into the loop, eventually the PageRank in that loop would reach infinity. Infinite PageRank isn’t that helpful so Larry and Sergey introduced a decay factor--you could think of it as 10-15% of the PageRank on any given page disappearing before the PageRank flows along the outlinks.

[Ramblings of an Unknown] Enough 'do follow' - Back to 'nofollow': As a longtime supporter of the “do follow” movement, it is really hard for me to do this - going back to “nofollow”. This is certainly not the way that I ever think, but there comes a time when person has to say “enough”.

[SEOmoz Daily SEO Blog] SEOmoz | Whiteboard Friday - Matt Cutts on NoFollow: I think that telling us what we've been told / guessed / proven ourselves is a little bit like walking into Math 451 and going over how integers work. He knows, and could succinctly recite, a bit more than this, I think, but I also recognise that he can give SEOs the tiniest piece of information and we'll run amok with it to our own advantage.

[Search Engine Roundtable] NoFollow To Cause Revolt: Wasted PageRank via Sculpting ...: As you can imagine, both the nofollow sculpting topic of wasted PageRank and the fact that JavaScript links may now need nofollows added to them, are pretty major. Stuff like this can cause a revolt in the SEO world.

[SEO Design Solutions] SEO Design Solutions | Forget No-Follow: Try This PageRank ...: In the event you are curious to what the reference is for theme bleeding (it is covered in Charles's post), or you can refer to our post on theme density and theming and siloing for a larger overview as an effective alternative to using flat site architecture (keeping all files in the root folder vs. subfolders segmented by topic) for search engine optimization.

[SEOmoz Daily SEO Blog] SEOmoz | Whiteboard Friday - How Do We Plug the Nofollow Leak?: I don’t think I have the math to work it out formulaically (maybe Rand or Leslie Rohde has) but, if nofollow was like applying a negative to manipulate this focussing of value by selectivley choosing/reducing distribution of the value, then how about the flip side...does adding/reducing actual links from some pages to other pages have the same effect? A little clunkier and less convenient maybe...but still seems to work in testing...just not as pretty.

[Search Engine Land: News About Search Engines & Search Marketing] Google Loses “Backwards Compatibility” On Paid Link Blocking ...: tends to get used by the industry as a catch-all sometimes inadvertently.) Because I would say that it’s still good practice to nofollow links to registration and sign-in pages (and other pages you don’t really need indexed) just because the fewer of those pages Googlebot crawls, the more time there will be to crawl the pages you really do care about having indexed.

[SEO Fast Start] Google's "Operation BENDOVER" Exposed - Nofollow & PageRank Sculpting: This whole subject is now being further discussed at the Cre8asite Forums in a topic titled, Bubble And Burst, The tragically funny rel=nofollow fiasco: your readers may find that of interest. Reply.

[SEO Marketing Promotion] Do Follow No follow Pagerank Sculpting- SEO Marketing Promotion: Normally all the links would get an equal flow of page rank juice but with the no follow attribute they could allow all the juice to flow into .If you're interested in Page Rank Sculpting and want to read more Google created an actual page to help you better understand what's happening.

[SEO Assur] PageRank Sculpting with rel=”nofollow” Useless Better Site ...: There are a number of great SEO Tools on the Web but HitTail is one of the best for finding the right keywords for topics, titles and link anchors.

[WebProNews Videos] Video: Google PR Sculpting and Nofollow Debate Revisited: We first told you about the debate in our interview with Stephan Spencer. In a nutshell, it appears that the risky practice of PR sculpting is not as valuable as it once could be and the way Google views nofollow is also evolving.

Reflected tags on Technorati: Blog, Nofollow, Targeting Spam