The spellbok will be an integral part of the UI for every player, but especially for those who decide to focus on Magic.
[Weakness] The current (Beta 2B) Spellbook is very cluttered.
[Suggestion] Better organization, to allow the player to quickly find the spells that interest them.
Here's a little image I worked up.
The left page will show spells that we have already learned. The right page will show spells that are available to be learned. Both pages will only reflect those spells of the selected School.
As you can see, there are clearly identifiable tabs along the left side, that allow us to select a School of Magic to look at. (In the image, we have Fire, Earth, Ice, Air and Life)
Tabs along the bottom of the left page will allow us to quickly show only spells of a certain type. I'm not sure what the current categories are, but examples could be Summons, City Enchantments, Combat Spells, Creature Enchantments or Global Enchantments.
The current in-game spellbook only shows an icon & spell name, with an information window on the right page. I would prefer to have a display option available: text or icon.
A text display would show a list of spells (sorted by mana cost, or alphabetical?), with the title, casting costs, and description.
An icon display would show a matrix of icons & spell names, also sorted, much as the current UI uses. An info window (perhaps the top half of the right page?) would list the actual spell details.
