On Thursday night, I attended a Computer Audio Seminar at a local audio dealer which was given by people from AudioQuest.
Of course, they were "pushing" their cables but their demo was pretty impressive, They had a MacBook Pro with an external hard drive running JRiver and they were streaming from the laptop to a dCS DAC + Moon integrated + Sonus Faber speakers. Then they used JRiver to stream from the laptop to an Audio Research digital player.
I was impressed both by the sound and the JRiver interface, Very cool app indeed!