People blog about all kinds of things. I like to write about knitting and family history. Some people blog about mundane things as a way to keep in contact with friends or family, kinda like an ongoing cyber-Christmas card. Here are a few blogs that I find interesting:
Post Secret this blog updates every Sunday, has spawned books, and is a rather interesting commentary on our society and what people fell they can't share with friends or family.
WW1: Experiences of an English Soldier This blog is written by the grandson of a WWI soldier. He basically transcribes the letters sent by his grandfather. They are being posted 90 years from they day they were written. I think this is particularly interesting in respect to all that is going on in the world now.
The Bloggess I've only read this a few times, but I linked to one particular post of hers that is rather funny.
Crazy Aunt Purl she's pretty funny.
Yarn Harlot and just because she's funny and a knitter.....gotta have a knitter!