I've recently been exposed to this tag which informs the mediabot for Adsense where in your site, it should search for relevant keywords for displaying ads. It looks something like this:

I think on this blog, since it's focussed almost exclusively on SEO or Adsense, most ads displayed are of those nature but the code could be very useful for personal blog owners, who normally writes whatever that comes to their mind and usually have lotsa links on their sidebars. Other good candidates for this code would be forums where you can target a specific part of the discussion for the ads to show.
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Currently, there has been numerous debates about the different factors affecting SEO and one of them is the relevance of a title attribute to links for SEO. For the benefit of those who are not sure what I'm talking about this is an example (*note the title part):

Is it really worth spending more time to add them to your article, especially one with lotsa links?
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