Andrew Grumet provided some links to sites that categorize blogs in response to my post on promoting diversity in the blogsophere and supporting many categories of blogs beyond politics and technology. This is much appreciated and I took a look.
The Syndic8 site offers its listings, as well as those from the Open Directory Project (DMOZ). The Open Directory project is “the largest, most comprehensive human-edited directory of the Web. It is constructed and maintained by a vast, global community of volunteer editors.” Its data is used by the major search engines according to the DMOZ site. The project covers regular web sites as well as blogs. Syndic8 has an extensive hierarchy of categories and you can drill down to a very narrow focus but it does not appear to rate the sites. Also, many of the sites I found were simply newsfeeds from the same source. For example, all the basketball feeds in Syndic8 were from the Moveover newsfeed and all the NBA sites in the DMOZ where from the Topix newsfeed. The Boston Celtics category also had some irrelevant listings from Topix including news from Carmel, NY. The official site of the Celtics was not listed nor was the overall NBA site. But this is promoted as a work in progress with more user involvement invited so the opportunity is there to make it better.
Blogstreet offers ten categories (e.g., business education, technology, etc.) with blogs in those categories listed by their ranking (based on number of blogs BlogRolling them). The site also offers the overall Top Blogs decided on the same criteria. This list has many of the favorites on other lists to no surprise. Blogstreet also provides the most Influential Blogs which features those blogs which are blogrolled by other Top Ranking blogs. This seems circular but maybe it factors out those blogs with lots of fans amongst the “little people” and those feeds automatically provided by RSS feed readers like the blogs of Doc Searls and Joho the Blog, driving up their usage with every new feed reader user.
W4 k-collector aggregates content within classifications based on 4 classifications: What, Who, Where, When. So you can look at topics, people, places, and dates There are a large number of categories and you find actual postings from blogs, not blog sites when you drill down to a category like knowledge management (187 posts) or a person like Roland Tanglao (63 posts), Dave Winer (547 posts) and Al Gore (5 posts) or places like Harvard (364 posts). This is potentially the most interesting site. The only concern is that the blog posts seem to come from a limited number of blogs so there is a small universe of content. For example, the last twenty posts on knowledge management came mostly from just two blogs, with one each from two other blogs. The same two blogs, which are both excellent, accounted for almost all of the posts in the knowledge economy category. There is no explanation why these posts and blogs were chosen but you can certainly evaluate the material yourself and it is mostly good. There are also no ratings like Blogstreet but that may not be a bad thing.