Made a rookie error when transferring ratings to RYM a few months back, and stopped. Now, I have 668 albums that I'm wanting to transfer and no real system to where I can find them. Oh good.
List is NYP stuff I've come across that I think is at least decent, so hope you find some good stuff :]
It is a very slow process. I had to transfer 2000+ ratings a few years ago and it took about a year lol. Obviously I transferred a few albums whenever I had a chance while at school.
Open a window with your Sputnik ratings and snap it to the left side of the screen. Then open up RYM in another window and snap that to the right side of your screen. Should speed things up that you don't have to jump between windows.