The first, big group are those blogs that are "truly awful". Second are the blogs such as Burning Our Money - which analyses in detail how taxes are spent - which are thoughtful and well written, but only of interest to a small, technically-minded community.
Then there are sites that cater for a more general audience, which operate more like the comment pages in newspapers, giving a forum for debate and finding the most interesting arguments from the more technical blogs.
Finally, there are the "attack blogs" such as Devil's Kitchen, which are out there to snap at the heels of everyone else and fight for a particular political view.
I have to say that I suspect Mister Shane Greer might have had something to do with this, but it's welcome all the same.
It would have been even more welcome had your humble Devil actually got any traffic out of it...