Moderating a FAQ
That is exactly the reason why I started doing my monthly "How To" Column.
So many questions get asked repeatedly, that often I would find myself and others giving a good, detailed answer the first time or two, but then after being asked over and over, the answers were getting shorter and shorter.
In the "How To" Column, I try to pick a topic that has been getting beaten to death lately, and give it a good answer. Then, if and when people ask the question again later, I refer them to the column.