also one thing that is interesting is this:
Using HTML5 elements such as <aside> or <nav> means putting semantic structure into the document body itself, but actual meaning is still derived from the content. For example, using meta tags, I could have a page selling prescription medication, but give it tags saying it is an article about fishing. With HTML5, I don't have that ability, all I can do is wrap sections of the content in elements that suggest which bits are the title, the article body, navigation, etc
Basically the current generation of the Web, we are essentially hyper-linking to and thus searching "pages" with a strong focus on meta elements in the header of the page. In the future I strongly believe that we will indeed be searching "semantic elements" instead of entire pages.
And the concept instantly links in my mind with a recent "TED" talk I listened to RE: the future of the web: http://www.ted.com/talks/kevin_kelly_on ... e_web.html
I know this may be drifting a semi-off topic (but focusing heavily on the semantic argument), but why not something a little compelling for your Sunday afternoon.
If you consider the speed that the web is evolving and how it is evolving, you can clearly see where things are going in a general sense. Massive expansion with a need for meaning associated with content (semantics). HTML "5" (living standard) I think really addresses such an evolution if not now, as the spec itself evolves WITH the web.
The way the web is expanding, we simply cannot afford to have meaningless linkage.