I use my Mac Mini the following ways: Digital music playback with iTunes and remote w/frontrow software. I record vinyl. I also record DVD-A, DVD-V & SACD output from my Esoteric DV-50. I use iTunes for internet radio. I have an AirPort Express connected to my HT Pioneer Elite Receiver's internal DAC down stairs in the den and play music that way too. I do not use the Mac Mini's internal hard drive for music storage, I use a 750 Gb portable hard drive. Great little device.
Good Luck
Good Luck