Back to topic ladies and gentlemen.

Here are some important updates on my research and tests. Please read first the parts of the interview below, before you jump to my thoughts:
Wige at WPW brought up this:
Matt Cutts: If the destination page has a noindex tag, that has no impact on the distribution of pagerank at all, because Google still follows the links, and thus must calculate outgoing pagerank.
Eric Enge: Can a NoIndex page accumulate PageRank?
Matt Cutts: A NoIndex page can accumulate PageRank, because the links are still followed outwards from a NoIndex page.
Eric Enge: So, it can accumulate and pass PageRank.
Matt Cutts: Right, and it will still accumulate PageRank, but it won't be showing in our Index. So, I wouldn't make a NoIndex page that itself is a dead end. You can make a NoIndex page that has links to lots of other pages. For example you might want to have a master Sitemap page and for whatever reason NoIndex that, but then have links to all your sub Sitemaps.
Eric Enge: Another example is if you have pages on a site with content that from a user point of view you recognize that it's valuable to have the page, but you feel that is too duplicative of content on another page on the site. That page might still get links, but you don't want it in the Index and you want the crawler to follow the paths into the rest of the site.
Matt Cutts: That's right. Another good example is, maybe you have a login page, and everybody ends up linking to that login page. That provides very little content value, so you could NoIndex that page, but then the outgoing links would still have PageRank.
Now, if you want to you can also add a NoFollow metatag, and that will say don't show this page at all in Google's Index, and don't follow any outgoing links, and no PageRank flows from that page. We really think of these things as trying to provide as many opportunities as possible to sculpt where you want your PageRank to flow, or where you want Googlebot to spend more time and attention....
... We did an interview with Rand Fishkin over at SEOmoz where we talked about the fact that NoFollow was a perfectly acceptable tool to use in addition to robots.txt. NoIndex and NoFollow as a metatag can change how Googlebot crawls your site. It's important to realize that typically these things are more of a second order effect. What matters the most is to have a great site and to make sure that people know about it, but, once you have a certain amount of PageRank, these tools let you choose how to develop PageRank amongst your pages....
... The URL removal tool is another way to do it. Typically, what I would probably recommend most people do, instead of going the NoIndex route, is to make sure that all their links point to the version of the page that they think is the most important. So, if they have got two copies, you can look at the back links within our Webmaster Central, or use Yahoo, or any other tools to explore it, and say what are the back links to this particular page, why would this page be showing up as a duplicate of this other page? All the back links that are on your own page are very easy to switch over to the preferred page. So, that's a very short term thing that you can do, and that only usually takes a few days to go into effect. Of course, if it's some really deep URL, they could certainly try the experiment with NoIndex. I would probably lean toward using optimum routing of links as the first line of defense, and then if that doesn't solve it, look at or consider using NoIndex.
Original source: http://www.stonetemple.com/articles/interview-matt-cutts.shtmlEverything is clear to me so far. For you too? If yes, go on reading.
Matt Cutts said:
So, if they have got two copies, you can look at the back links within our Webmaster Central, or use Yahoo, or any other tools to explore it, and say what are the back links to this particular page, why would this page be showing up as a duplicate of this other page? All the back links that are on your own page are very easy to switch over to the preferred page.
How easy is it to switch over to the preferred page? And what would you do if the backlinks are not on your own page, and come from external web sites? Implementing the
canonical element? Maybe that could be an option. But will that work 100% as you desire? Is that always so easy to implement? Can you rely on that entirely, expecting to have full control and full satisfaction? To be honest with you:
ME NOT! Why not me? Google claims:
What happens if rel="canonical" points to a non-existent page? Or if more than one page in a set is specified as the canonical version?
We'll do our best to algorithmically determine an appropriate canonical page, just as we've done in the past.
Can Google follow a chain of rel="canonical" designations?
Yes, to some extent, but to ensure optimal canonicalization, we strongly recommend that you update links to point to a single canonical page.
Original source: http://google.com/support/webmasters/bin/answer.py?answer=139394Did you watch the video there? If yes, do you also
dab-dab-dab? 
Canonical Element does not provide a guarantee:
http://www.youtube.com/watch?v=LnXponbEHjw&feature=channelCan you rely entirely on the
"canonical" element? Is there probably an alternative which can be far much better and secure?
Here are my most recent thoughts:I have link on page A http:// www. seoworkers. com/goforit.html?bots=nocrawl
The destination page B has outbound links to other site pages or sites. So it is not a dead end.
In the robots.txt I have this:
User-agent: Googlebot
Noindex: *bots=nocrawl
Tested already several times, and it is sure that destination page B does not get indexed.
And even if there is an IBL from other internal pages or external sites, it does not get indexed either.
If I would disallow Googlebot to access the destination page B for example like
User-agent: Googlebot
Disallow: /goforit.html
... I would have created a dead end, since I would block Google accessing the destination page, as we discussed above.
That would nothing different as blocking pages with the "Disallow" directive in the robots.txt. Don't we create dead end (dangling) pages that way?
Therefore, I strongly believe that is the best alternative to avoid dead end (dangling) pages, if I can make sure that the destination pages have at least one outbound link.
Don't you think?
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Notice: Googlebot supports the robots.txt directive "Noindex" since a long time, it is just not official.
I updated my robots.txt. If you look at it carefully, and you agree with the above, you will find it very interesting:
http://www.seoworkers.com/robots.txtI also updated the robots.txt of a customer with his permission to test, which is even more interesting to look at:
http://www.gameshop.gr/robots.txtDo you still think that the implementation of the
"nofollow" attribute is a better solution when it comes to PageRank Siloing? Think twice before you answer.
SEOers Experts Unite! 