Could you post some details of exactly how the new scoring system works?
The Help details on the webpage still refer to PPLNS.
How does this affect people mining on one of the dedicated pools, rather than the multipool?
from DeepBit: "You get a portion of every solved block proportional to your part in pool's hashing power."
Flound can correct me if I'm wrong but this is the way I understand it; Let's say it took 10000 shares before a block was found and you submitted 200. You would get 200/10000 (2%) of the value of the solved block.
To me this is the best and most fair payment method. You get paid exactly the amount you should for the portion of work you put in.