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Thread necromancy
	
	
		I'm aware that some people don't take too well to this, but I find myself doing it on accident quite a bit. I have my display settings adjusted to where the forum will display all threads, regardless of date. So I often stumble across older posts and am tempted to reply without checking the date beforehand.
Is this too much of a problem? I don't think resurrecting a good topic really hurts the forums, or anything. However, I can try to pay more attention if it is an issue.
	 
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		It tricks other people into thinking the thread is new, and then they start "replying" to posts that are actually months old.  If you view a thread as a conversation, it's like one person continuing to talk while everyone else has walked out of the room without saying anything.  The one person left will look and feel foolish.  
This is especially a problem in threads where people are asking for advice; the problem people were seeking help with may be long solved, and people may not really want to revisit the issue.
It's also especially a problem with threads that have been closed for so long that people's views or opinions may have changed over the time the thread has lain dead.
	 
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		Excellent answer, Dr Unne.  That about covers it all.  :)