Well, we all know how annoying the over-head camera view is. Not sure if everyone here is familiar with runescape, but the camera angle there lets you "get behind" quite comfortably behind your character. Now, I have read here somewhere that this was a bit of an issue with the developers because doing that requires more polygons to be drawn (or something), which requires more graphical capabilities on the player's computer.
Well, in runescape, when the camera angle in behind the character, you would expect to see very far out. However, that's not the case! You just see a white fog far out and are essentially drawing out the same "polygons" or whatever. This fixes the annoying over-head camera issue and does not require more polygons to be rendered, etc. Plus, it creates a more immersive feeling.