Opinion Radars: a quick and easy way to aggregate bloggers' opinions ?

"How can we easily gather bloggers' opinions about specific topics? How can someone get the blogosphere's view about 'Iraq' or 'Michael Jackson'? Or at least, of those bloggers who want to clearly state their opinions on such issues?

Now there are some cool tools around (Blogpulse, Technorati, Feedster, etc.), but they are not accurate enough about any given topic. And even if we carefully select and verticalize the RSS feeds, we risk to have in the same RSS flow both stories about software patents and posts on 'Sex Gandam' images.

Maybe a mixing of Folksonomy approach (Folksonomy is 'a practice of collaborative categorization using simple tags') and the Technorati TAG could do the trick."