I haven't used a "system" per se. The problem I've run into with some of the dance notation for other dance forms (what I've seen them anyway) is that, as is the western way, they tend to concentrate on limb movement and levels and don't do much for core body movement, which, of course, is the basis of our dance. But if someone has found something that really works, I'd love to hear about it!
Sadly, to this point my dance notation for my troupe has been a hodgepodge of words (brief descriptions or my own personal names of movements), stick figure drawings (with "noses" to indicate facing direction and little arrows around various body parts), and colored dots with directional arrows (to indicate blocking.) I suspect my dancers hate me by now....
I've also found that video taping the choreography at some point helps preserve it for posterity too. That way, when a year later we look back at my crazy notes and drawings we can compare them with the video to remind ourselves what the heck I was talking about. After that, the goofy notation makes more sense again.