Less Wrong (http://lesswrong.com/) modified the Reddit code and made a "community blog" with long articles. The concept of blogging really has taken over this ontological niche, but there's room for a lot of variation in what you call a blog. It's flexible enough to cover everything from really long articles to tweet-at-a-time adventure serials like http://twitter.com/Othar .
I wonder what other types of blogging are still uninvented, or at least not yet popular.
Yeah, it seems like long-form pieces have just been decentralized to blogs. You can still publish quality stuff at Kuro5hin (if you introduce yourself in the Diary ghetto first).
The decentralization to blogs seems like a shame to me. Publishing in a public sphere like Kuro5hin guaranteed an automatic audience, whereas publishing something on your personal blog is more of less a shot in the dark unless you're already famous or somehow get picked up by Digg/Reddit.