I dont know if this has been done before, but I have just computed some pobability charts. Might come in handy for a GM.

1st: Probablity to reach or exceed a certain treshold y

2nd: Probability to win or dra with x dice in an opposed test versus y dice

3rd: Probability to win in an opposed test versus y dice

find it here: http://www.serbitar.de/stuff/probabilities.pdf

All possiblities from 1-12 dice.