One weirdness (which I hesitate to call a bug, although I've considered emailing Mark about it) is that when you reply via the web to a thread with a changed subject, either by splitting or some other means, the original title appears at the top of your reply. The more I think about this, the more I think it's a bug. But I haven't thought it through 100% yet. It is certainly annoying and disconcerting.
--
J