With "Ads Choices", Google provides several tools for web users to opt out of interest and demographic advertising, view/add/remove the categories currently focused on them and even see details in the cookie used for tracking. On the other side of the coin, ad testing confirms mouseovers are being tested with ad units, but seem very limited. According to the official AdSense blog, the familiar "Ads by Google" will soon be replaced with a new "AdChoices" notice, label and icon which, when clicked, will take users to a page that explains the ads, online advertising and provides a link to the new options page.

You can use some of the tags now, rel='keyword'; they work without converting the to HTML5. The cooler new toy seems to be SIDEBAR. The A LINK rel='sidebar' opens a "favorites" dialog to add the link to favorites. It only works in HTML5 enabled browsers (Opera and Firefox and maybe the new IE9 if you're daring enough) and behaves as a normal hyperlink otherwise. HTML 5 is NOT STANDARD yet, you should read the specifications before you assume tags mean the same as before or what you think they mean. Refer to the differences between HTML and HTML5 to learn more.

Replace nofollow tags now (rel=nofollow) because it's definitely meant to specify PAID LINKS, telling search engines HOW MANY links a site is being compensated for.

It was officially announced that a recent change in the algorithm of Google's search is meant to determine original content sources and reduce search engine spam which is often the result of misused "Fair Use" regulations. In terms of fair use and distribution, bits of original content are all over the place that, in very rare cases, get reassembled in similar ways or are direct copies, copies that, due to some ranking advantage, got credit and traffic for the duplicated content. In past cases when a website has the right to use a portion of another's page(s) or use it as a basis for a new work and it happens to be a mega giant of pagerank, the more obscure of the two loses out, you know what happens.