Yahoo! Started The Semantic Web Era
For several years I'm annotating my web pages with various microformats in order to make them comprehensible both for humans and machines. This is what the Semantic Web is about. Until the day before yesterday it was just funny academic exercise - my FOAF profile, DC annotation of HTML pages, DOAP for MR, ...
Yahoo! finally gave to everybody purposeful reason why to annotate their pages. Thus started the era of the real semantic web. And others will follow for sure as it is not just about SEO.
Yahoo! guys proved that they are real innovators. Looking forward to new adventure - it's time to improve our webs ;-)