These things appeal to me, and were part of my thinking when I started textuality.org. I hadn't really finished the implementation, though. Each post got its own page as well as appearing on various indices, but each of the topics within a post didn't have their own pages. That made linking to a topic within a post difficult-- first because the reader would be constantly jumping between otherwise-unrelated posts and trying to find what I'd linked to on the page, and secondly because Tinderbox had a hard time exporting that feature because it couldn't tell whether the endpoint of a link was a page (blah.html) or an anchor (blah.html#ablah)
So last night I finished the implementation and gave topics (Anders calls them sidebars) a template that not only makes them readable but which makes explicit where the reader has ended up. There are links to neighboring topic-pages so that the reader can continue on at the topic level, and there's a link to the post (parent) that originally created the topic. Oh! And there's a perrmalink to the topic as it appears in the post, which is where I'd rather a linker send a new reader. It means that every single character in the posts appears twice in the html --once on the topic-page and once in the entry-page-- but 'disk is cheap', and that's a small price to pay for all this freedom...
I didn't do it quite the way that Anders did. I considered it, but it's a bit limiting. Besides being a blog, t.org is intended to become a directory of readings of 'nouns' in the field of hypertext-- articles, hypertexts, people, events, etc. I don't want to limit myself to having post = noun; I want a post to potentially contain 'nouns' (some already do), or to not be a noun at all.