A friend of mine found this while surfing the other day, and it's interesting ...
Use the left mouse button (zoom in) and right mouse button (zoom out) to zoom to various data, such as salary comparisons by leagues, divisions, teams and players. Here's some other useful key presses:
Shade by 2006 zips [z]
Shade by age [a]
Position highlight toggle [p] [space]
Title Detail Toggle [k]
Team to Yankee Comparison [y]
Main title screen [h]