OK, let me rephrase: It's not much like PPLNS at all. It's more like proportional, only exponentially scored.
The big difference between PPLNS and prop is that PPLNS breaks round boundaries and is not exploitable, and prop maintains round boundaries and is exploitable. Scored proportional is a version of proportional and is exploitable.

That's a very "accurate" explanation and I completely agree with you. I didn't mean to argue about semantics.
I was merely trying to provide a simplified explanation (although not perfectly accurate) which would make it easier to grasp the idea and the differences - especially for people who recently joined the bitcoin mining world.
I understood what you were attempting, and the reason for doing so. But since slush's payment is based on round results ( proportion of shares per round) and PPLNS is not, I thought it was introducing unnecessary confusion.
I applaud your attempt to help new miners understand, though. That sort of help doesn't happen enough.
Anyway, if Gamah wants to look at the posts to which I linked it should all be made clear for him. You'll be able to tell if he read all three posts because if he does he wont be back for a few hours
