On the WIS forums is a link to a formula created to simulate Wins Above Replacement. We at Get Up Get Out of Here Gone plugged them in, and here is what the results were:
Top Twenty-Five Position Players:
Top Twenty-Five Pitchers:
Top Twenty-Five Relievers (7 Starts or Less):
Top Twenty-Five Offensive Seasons based on Weighted Runs Above Average:
Top Ten Defensively at Each Position:
And the dubious least valuable position players and pitchers: