My players have a hard time differentiating the different dice graphics in the ruleset. Also, they are always trying to view what their roll should be.
I propose adding a number in the middle of the attribute/skill fields that indicate the value of the die for that stat (4,6,8,10,12). Also, when there are modifiers, it would be nice if the modifiers were visible, like temp modifiers in the 4E ruleset. (bubble with +/- number in upper right of field).
Sometimes it's hard to keep the dice on a character sheet apart visually - it is pretty hard to keep the d8 and d10 apart. This is especially bad for GMs setting up personalities/NPCs.
Increase usability by changing the dice graphics - put the maximum number for each dice into the graphic (8 for d8, 10 for d10 and so on).