There are a lot of good blogs. When I find one I like, I usually mine their personal blogroll (list of blogs they read themselves), and often find I like some of them as well.

I find the best bloggers are people who write to a specific subject, in the sciences, or geared toward whatever they are focussed on. I read a lot of biology, archaeology, paleontology blogs, a few writers' and artists' blogs, a few political blogs.

The political ones are usually rants, but often informative. The science blogs are just fascinating to me, as many of them are geared to explain science to laypersons like me, and they often attract intelligent commenters who are also in the sciences, so interesting conversations and debates occur. Arts blogs are usually geared to describing or defining the creative process, and as such are interesting to me, maybe not others.