I think it is funny that when I started searching the Technorati site, I pulled up one of the RSS feeds I've found. The search term I used was geology. I think content will be big for me to follow. Science changes so rapidly that we have to change what we teach. So, tags like geology, astronomy, meteorology will be huge. Natural resources and global climate change also will be big, and thought provoking, I'm sure.
I also worry as we promote the tagging that critical thinking needs to continue to be taught. Any random person could be blogging on there and our tag hit just moved them up on a list of "experts." Without caution, we are just adding to the feeding frenzy.