Currently you have to have a high reputation to edit someone else's question. I think this is great most of the time but during the private beta it seems like the limit should be lowered quite a bit to allow users to edit questions during the private beta. Maybe 150 or something would make sense. The point of the private beta is to get good questions up there and allowing the edits at a lower level would give us the chance to "fix up" some of those initial questions right away.
This is already the case; see
private public beta beta gold so Edit other people's posts 500 1000 2000 2000