[rafiki]

If you're ok with spending 30$, there are some GREAT books. I dunno where you live, but in Canada our chapters stores have them. You can actually just go read them in the store with a coffee. The scary thing is you think the game is complex now, when you read a few pages, it'll scare you just how chess like it is. And the fact that tight ends and linebackers are becoming as mobile as receivers/corners from 30 years ago is really scary. The game still has so much potential evolution given the physical potential these players now have.