The way I do it is to write 500 words a day on some random subjects for no reason other than it's "interesting" on published it on a single page called Notes and Thought. Then I continuously work the various areas of that pages, adding new paragraph, fixing grammar mistakes, and so on. Eventually, one of the section in my page will grow into a essay. When an essay is spun off, I also work on the essay to make sure it's complete-sounding and all polished up. However, they are never actually finished or frozen in time, and they will be continuously updated for the rest of their lifespan. Notes and Thoughts also linked any spun off essay with the original section and an abstract describing the content of the new essay.
Blog posts are temporal in nature, and they never get updated continuously. So a hundred year from now, the blog post will say the same thing, still feel amateurish, and also horrifically outdated.
If you want to know what I am working on: http://kibabase.com/articles/notes-and-thoughts
Blogging is more like a conversation that's very time specific. While mine is more like a book or an encyclopedia of my mind.