I usually mark the question as a "favorite" if I want to be able to have some hope of (more) easily finding it again in the future.
Another alternative is, of course, to bookmark the post in your browser. I tend to do this less often as I tend to find it more, well, tedious. But I do sometimes also use browser bookmarks, just a lot less often.
Are you asking for a different way to save a list of questions? If so, could you provide more detail on what you think you might be looking for? I'm not sure it exists though.