I don't know if Physics.SE or other SE sites have this feature.
If they don't, I suggest a new feature. Can we have the questions and answers available as downloads. We can simply save the html file but it's tiresome when one wants to download too many questions. Can we have a topic-wise(or should I say tag-wise) collection of different questions? It maybe be a great help to students and teachers as it can show the wide range of questions which can arise out of a topic and it can also address some common misconceptions.
We can have it like a separate set of files for questions related to a particular phenomenon. For, example all questions related to Hawking Radiation available as download.
EDIT: For example, this page is an archive of deleted popular questions.