Here is my rating from the four training tools posted below. It represents about 250 rated computer games over 9 months. Growth is 290 points, or averaging about 32 points per month. Which means I'm on track to become a Grandmaster by age 137.
Playstation 2's Chessmaster is by far kicking my chessboard butt the most. It was the best $10 used-game investment I've made and, sadly, is probably the most accurate in measuring my skill. Even if it's not, I prefer using it as my acid test of accomplishment, since it seems to be the most rigorous and unforgiving of the four.