I mostly just read those kept by my friends. Most of them wouldn't be too interesting to someone outside of my group of friends. One of my friends started one that was his life, embellished...sort of in the style of Big Fish (at least that was his inspiration), but it has , sadly, become just your standard, everyday blog. I've been using mine to write a story. That's that Cottage. Cheese. link down in my sig.
I'll have to check out some of the blogs linked in this thread.