I've previously written about long-running topics and I've asked about software for blogging. But I keep coming back to doing some simple blogging on Tildes. I don't think Tildes should try to compete with real blogging software, but maybe Tildes can support a minimal version of it, enough to make it worth doing it here when starting an independent blog isn't worth the effort? An example would be a project diary (like for my accordion synthesizer project). We could encourage people to start a topic for each of their creative projects that they want to talk about and to post updates as they make progress. Or, perhaps this would be a way to cover some ongoing story that they want to live-blog?
I've refined my ideas a bit about how it might work: Suppose a Tildes topic contains a list of zero or more updates in chronological order? Only the original author can post an update, but anyone can write comments responding to any update. When you post an update to one of your topics, the comment tree for each previous update gets collapsed, encouraging people to comment on the latest update.
When a topic gets an update, it reappears in the topic list with a separate set of votes, showing both the original topic's title and the update's title concatenated. Any old listing is removed, so we don't show the same topic twice. However, maybe the topic heading shows the last three updates or so if the topic is getting multiple updates in a short period of time, as might happen when live-blogging.