I do rather a lot of editing (I'm not sure how much, but I don't have my copy editor badge yet). By and large the main thing I notice and edit is people putting tags in their titles. On Stack Exchange, that's as unnecessary as signing your posts: everywhere your question appears on the site (barring links), its tags are also right there. We can tell whether you're asking about XNA or Unity or Unreal because right beside the question we can see xna or unity or unreal.
There are question titles like: How to create an extensible rope in Box2D? Those are fine, it's a fluid sentence. The case I'm talking about are questions like these (which I've edited) where there's a tag just sitting in the title to be there:
- cocos2d rotate sprite to touch
- [multiplayer]mouse based movement ?
- Unreal Editor (Unreal Tournament 3) Why does the loaction of my vehicle spawner change when I open a matinee?
What can we do so our users won't feel the need to tag their question titles like this?