Testament said:
I'd buy these in an instant. Especially number 1 & 2. This is exactly the sort of thing we need, nice thinking howandwhy.
Thanks Testament.
I had posted an idea about a flavor book a while back too. Something that would give a short list of flavorful justifications on each and every one of the rules in the Core Book rules.
The wizard class for one could benefit greatly. For example: Multiple reasonings on why spells levels exist (or how to play with them transparently), why they need books to memorize from, why they can only memorize spells from their own personal writings, why any arcane caster can cast arcane scrolls, but spell books cannot be used in this way, etc. The number of rules without explanation is extensive.
Potentially, a newbie DM could pick and choose (or be inspired by) the justifications they will use to individualize their campaigns. Presumably world books already do this, but I rarely see such explicit explanations in most books published. IME, more seasoned DM's already do this sort of thing and allow their players to learn the particulars through trial and error. I think this helps engender a sense of wonder and exploration as neither character nor player knows the answers, but can sense an underlying truth.
Don't get me wrong. I know that 3rd edition is all about options, and for me its flexibility and rules potential to support flavor is better than any other D&D verson. This idea may seem like coloring in a coloring book which made for DMs to fill in, but more often than not I see games where no color is added at all. I believe there is a need to entice some DM's imaginations again. (like mine

)
Sure mud can be black, red, or even yellow. But when you're up to your nose in it, knowing why it is that color becomes extremely important.