When you go into Settings > Location Services, it will show you the list of applications which are enabled for Location Services. I have seen that before. But for the first time I noticed that if you used one of those apps in the last 24 hours, it will show a little cursor icon next to the service to indicate the app has used it recently.
Kinda neat eh? I don't know if this is a new feature since the whole privacy debacle a few back and the 4.3.3 update released it or if its always been there, but kinda neat.