I remember Jeff saying, when they announced Server Fault, that it was going to be possible to move questions between sites. I'd find that feature very nice as since then I've found at least 10 questions on either site that belonged to the other one.
If you have 3k rep, you can nominate this by voting close: "belongs on serverfault.com" etc; at 5 votes it is moved by the system.
If needed, a ♦ moderator can do this immediately; so if it is obviously on the wrong site, but in a low traffic tag, consider flagging it for moderator attention.
It might be useful to have a way to immediately move your own question before there are upvoted answers - similar conditions as for deleting your own question.
It happens too often that a question is voted on to belong to another site, but at the same time downvoted too. This could be prevented by immediately moving the question. Especially newbies not aware of the other sites will profit by this.
It would be nice to have a way to alert the moderators that you'd like a question moved. This might be a big help to newbies.
Could this not be sone wholesale based on a tag?
If we can vote a tag as belonging to another site like "Server2008" then if someone uses it on Stack Overflow they are prompted to move the question at the point of entry?
It can say "Is this a programming question? if not it may belong one one of the sister sites...bla bla".
It would be interesting, in the remote future, for the StackOverflow app to expose question moving to its API. That way a question could be moved from one SO website to another even if they have different owners.
It just happened to me to post a question on the wrong website and I'm just waiting to cast enough votes in order to have it moved (not to ask it twice). Maybe a "self-voting" or "self-moving" could be quicker?
Click on 'flag' under the question, than go to:
'should be closed' >> 'off-topic because' >> 'Super User' or 'Server Fault'