Technorati added the activity chart feature in mid-January like the chart below. I have yet to put one to use but I thought it would be a great way to display the blogosphere buzz leading up to the Super Bowl thus showing us a "bird's eye view" of the Super Bowl XL conversations monitored by Technorati.
Of course checking back on this post 30 days from now may display a different story of activity since the chart is dynamically generated and the Super Bowl talk may have quieted down.