[Suicide Junkie]

The autohost processes the turn for you, and indicates which PLRs are submitted so far.

The PLRs would be submitted via email, FTP, windows filesharing, or any other method you like.

For the FTP or filesharing option, you keep two windows open;
one to your local savegame folder, and one to the host's savegame folder.
Then simply drag and drop the new files as they are created.