…lets webmasters tell the search engine which parts of a web page contains it’s main content and which part is ment for, say navigation, ads, etc.

If adopted by the webmaster community, this should greatly help improve the quality of search results at Y!’s search engine. (and should also work as a nice SEO trick!)
More details here
Sphere: Related ContentThis tag is really about our crawler focusing on the main content of your page and targeting the right pages on your site for specific search queries. Since a particular source is limited to the number of times it appears in the top ten, it’s important that the proper matching and targeting occur in order to increase both the traffic as well as the conversion on your site. It also improves the abstracts for your pages in results by omitting unrelated text from search result summaries.
(From the post on YsearchBlog announcing the tag)
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