SB, in martial arts type things, my understanding is that those things are rope darts and even nunchuka are used similarly.
She-Ra, I think in this area you might have better luck pinpointing how you can lasso the moon from here, to tell you the truth. Since poi is a subculture, very little has been documented, and more than likely it's currently popularity is based on the monkey-see monkey-do theory in life where we travel, see something cool, figure it out and bring it home. Someone sees us do it, they figure it out, so on and so forth.
Good luck though. If you see anything conclusive, let us know!
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Pele
Higher, higher burning fire...making music like a choir
"Oooh look! A pub!" -exclaimed after recovering from a stupid fall
"And for the decadence of art, nothing beats a roaring fire." -TMK