I use Kimber Silver Streak(s) all the way through (CDP-pre-amp) and this thread got me curious, and from the searches that I did they were saying that the heat shrinked "Silver Streak" logo around the cable should read so that the 'S' is at the end that the source is on. I just went and checked and that's the way I have mine; I don't remember if those cables came with directions with them and that's why I had them all pointed that way, or if it was just by coincidence.
And actually I do remember, many many moons ago, hearing or reading that cables are directional, but that over time it would "learn" the other direction. "I don't think "learn" is the term that was used, but it's the best I can think of at the moment.