I was thinking maybe you could seperate what you see by adding in Books of magic so you're a little more organized in the UI department. When I want to cast a Fire spell all you would need to do is Click on the "Fire Magic Book" and it lists Fire Spells same goes with every catagory.

Also the Popup for Spell Description is so far to the right I'm always looking back and forth, maybe closer to the spell pointer would be a little less strenuous on the eyes.

I hope this picture I created works and helps you understand what I'm trying to explain If not here is a Link http://www.screencast.com/t/MjYyZjAzNWMt