WSJ writes on finding blogs in its “The Best Way To…”:
To find a blog that matches your interests, try starting with a community blog, a general site where people post their commentary on all sorts of topics. What makes them useful for blog searchers is that many of the people who post items on these sites have blogs of their own, so if you find something interesting, you can check out the blogger’s personal site. One of the most popular of such community blogs is MetaFilter.com, which frequently displays 25 or more new postings a day, with links and comments from readers
The article has links to many directories. Missing: our BlogStreet.