The north in Google Earth!
There is one thing that annoys me in Google Earth and it is that as you move around, the north doesn't stay pointing up. I understand why it works the way it does now, but I wish it was possible to a least lock it in place temporarily. Searching online through many discussions about that, I found out that it is possible to make this a non-issue. Every time you want to readjust the north so that it points up, you can easily do it by pressing "N" without any modifier. It doesn't work exactly like locking the north up, but at least it is fast and easy.