Okay, maybe not exactly 101 uses but still one.
Do you know that you can use use it to view your DivX movies on a TV far far away?
No? You do now :)
Don't mess around with all your cables for audio and video, you can have it all in one cat 5e UTP cable - just attach two S-Video plugs, one 3.5mm jack and two RCA jacks. Maybe it's not all that perfect if you want 5.1 sound,but my crappy SB 16 can't handle it anyway and the difference is hardly noticeable.
The video signal also suits my needs and I can hardly notice the difference between using an out of the box S-Video cable and this one.
Now I must just get my Radeon to work in X Windows with TV out enabled :/