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Linking from a page back to itself has no benefit what-so-ever. A page has already benefited from the link juice coming to it, it cannot then pass that back to itself. Also, note that the first anchored text hold the most value, in fact a page back in 2008, Rand stated that it hold all the value:

http://www.seomoz.org/blog/results-of-google-experimentation-only-the-first-anchor-text-counts

Good internal linking is based on getting from the home page to the internal page in the smallest number of links. Keep you site shallow to help the user easily navigate to the important pages on your site.

http://www.seomoz.org/learn-seo/internal-link

And Finally, remember Google is based on user experience, this is something that does not benefit the user in anyway, that I can think of, so Google (and other SE's) will have made sure this hold no value to their algorithm.

Well, they're my thoughts.

From what I understand the links from youtube are a nofllow, which means it will not influence the target page's ranking. A nofollow instructs Google and other search engines to take no notice of the link as a means for authority. Otherwise that would be the perfect way to build links from an authority site.

Links from twitter, facebook, wikipedea are also nofollow.

With a limited budget for SEO tools, what would you suggest having that would cover everything. Lets say with a £200 a month budget. We only look after ourselves, which is around 5 accounts in terms of PPC, so SEO follows similar suit.

Is SEOmoz effective enough to cover all of our basis. Are there bits it is missing that are better else where?

What are your thoughts basically and what are the benefits of each tool.

Thanks in advance