This is a test solution, I'm not committed to using it forever. If you decide you hate it enough that you'd rather not read my journal, let me know. It should only post once per day.
I could probably rig it to tag posts as "twitter", but since you can't filter posts by tag anyway, it doesn't seem like there's a lot of point to that. So I haven't.
We'll see whether this turns out to be useful. Not worth burning a lot of time on it if it isn't!