BuzzBums is a blog directory. It costs $1 to join for a minimum of 25 years. They aggregate content and offer aggregated feeds for member blogs.
Haphazard list of blog networks from BlogNetworkWatch.com. Probably a useful site.
Weblogs Inc is a blog network of professional bloggers. One of the biggest in the business. Similar to b5media.
Posts in the blog networks category on ProBlogger.net (part of the b5media blog network).
A list of almost 200 blog networks.