I've received Notifications about people editing a question. Sometimes it's the OP that has edited the question, other times it's someone else.
I have two points of feedback about this:
I've taken a look at these questions after I receive a Notification and there is absolutely no indication that the original question has been edited. In my opinion, this is not good. Anyone who has participated in or is viewing that thread should at least have some indication that the question had been edited. Like the MSDN forums which shows who edited a question, when it was edited and for what reason they edited it. In my opinion, this is absolutely necessary!!
Personally, I don't like the idea of people editing other people's questions, answers or comments. And how is that even possible? Do some people have Moderator status? I am a Moderator on the C# MSDN forum. It was my understanding that Moderator status would transfer over to these Q&A forums, but if so, I don't see any way I can edit anyone else's questions (not that I currently feel like I need to, but as a way of judging that I probably don't have Moderator status yet).