I've decided to write an ongoing blog that revolves around things I do that Windows, consequently, does not do. This may apply to OS-X as well.
Moving Files that are in Use:
As I'm listening to music in AmaroK, I tend to move the actual audio files into folders as to separate the good from the bad.
As long as the audio file is playing, I can move the physical file anywhere on disc without interrupting playback; I'm guessing the entire file is either loaded into ram or the filesystem points to references, not literal file locations.
Windows, however, will give a "File is in use" error whenever you try to move an audio file that is being played. Meaning that you can only move it after playback has ended. Now, it's no 'killer reason' to stop using Windows, but it's one thing I do that Windows doesn't support.
Needless to say, I love having the ability to move my files when I say it's okay.
Attempting to play the file after moving it will result in an error. Obviously.