I follow several blogs, some are political in nature to keep updated on gov't elections, some are spiritual in nature to inspire me to keep going, some are practical like recipes, crafting ideas, some are more business centered. There is pretty much a blog on every topic under the sun. Some people actually write and manage a several blogs themselves.
What makes a good blog? Original content. Some people copy and paste, which can get people in trouble with copyright laws.
Original content is the way to go, make it interesting, have a sense of humor and network with other bloggers, and blogging networks.
A good site: http://blogsearch.google.com/
Type in a topic and you'll find a blog on it.
Come visit mine for a little Mom inspiration:
www.familysentinel.blogspot.com
~sahmatwork