When posts are flagged as being in the wrong area and moved, in some cases, there's a stub in the original area prefixed by "Moved:". In other cases, it simply vanishes from the original area and is moved to the proper place. Is this due to a difference on how they're moved or who does the moving? Just curious. I'd think that the first method is a little better since the OP can a little more easily find their misplaced post. There've been a few cases where posters were confused as to where their post went, after a move. Does the "moved: " stub automatically disappear after some point in time, to reduce clutter?
We can either move it or move it and leave a redirect which expires after a duration we choose (or the redirect never expires). I never leave a redirect.
I typically leave a redirect, but it's sometimes personal preference of the mod. I would also vote for our team of mods to leave an expiring redirect when moving a thread.
Mine typically expire in one week. The only time I don't leave a redirect is when I'm moving to a forum not readily accessible to everyone (for example, Politics) or when I forget (since it's not default).
I don't leave them because I move quite a bit of threads in the Gen III forums on a daily basis and don't want redirects around all over, expiring or not. Plus, it can motivate people, in the future, to post in the proper forum. That being said, it's not a big deal to me. I'll leave em' if people want them as long as I remember to leave one in the future.