A few things I noticed:

1.  When purchasing, getting items, there is no way to know how/what an item does.  The card doesn't pop up.

2.  Requirements for items don't seem to exist anywhere useful.  I buy some traveler'sboots, not knowing if they fit my sovereign's feet!  Guess they were out of my size?

3.  A wearable equipment screen (with a body with item slots) or something would be a nice addition, to tell what items do what, and what you have on a character (be it a sovereign or a hero).  Most of this art is already exists. 

4.  At the very least, there should be a mouseover card for each item, describing its abilities and pre-requisites.  Or perhaps a dialog warning that the item is not usable by the character before buying it.

5.  Trading items between various heroes, so that if they get something someone else can use, it can be either put in the wizard's vault at the capitol, or traded between the various heroes.

Thanks,

Ishantil