OK, let me try again to get this. This is what I think I know: Two particles are "entangled". Meaning they are somehow linked to one another. Their qualities compliment one another as in if one is "spin up" the other will be "spin down". When a particle is measured, it changes the quality of the particle and ends the entanglement.
So Observer A measures the spin of a particle, then observer B measures the spin of it's entangled mate, they will always observe opposite qualities. After the observation is made, the entanglement ceases.
OK, if that's right then I see how it can't be used for communication.
Also, what's the mystery? Some mechanism always generates these particles in pairs with opposite qualities. If you measure one "spin up", of course the other will be "spin down"
I know I'm still missing something...