When a post is edited, there is a field into which the editor can enter a summary of the changes or reasons for changing someone else's post. Should there be a similar field when deleting a post of your own?
Granted, many question deletions are because the question is voted down or the user realized the answer before any answers were posted, and many answer deletions are due to down votes or (often and) the answer is incorrect. However, this is not always the case. Sometimes I come across a deleted answer with a positive score, and I'm not certain why it was deleted. Maybe a moderator thought the answer was better placed as a comment, or maybe the answerer thought the solution wasn't so helpful after all, or maybe he just really wanted the Disciplined Badge. In any event, it might be nice to have the option to leave a comment as to why (even if this feature only exists for posts with a nonnegative score).