I don't know any "cable" systems that are suitable for damp locations, but the monorail types can be. Here's one.

Here is a link that might be useful: Monorail for damp locations

For some reason my responses aren't showing up, but I will try again. The monorail system is really nice, but it's still a ceiling based system. Are there any track based systems that would actually mount right on the walls, a bit below the ceiling? What about LED light emitting diodes under a soffit? Do they throw enough light, or are they just for mood?

I've never tried to put a track-based system on a wall in a wet location before, so I just don't know if that would work. You can contact the manufacturer to find out.

I see no problem mounting the monorail to your concrete ceiling, however. All you need are some very small concrete anchors.

I haven't seen any LED lights suitable for general lighting, though I know many companies are getting close. They put out very little light compared to their power use, so are only suitable for accent lighting, in my opinion.