I started filling in the ecosystem chapter. feedback is welcome especially on all the TODO items I left many places. Note, this is very unfinished, just wanted to get something out as quick as possible to feel out possible resistence or alternatives. ethereum/homestead-guide#29
Actually, I would be okay with using natural case across the guide as long as it is consistent. So outermost layer of sections (Introduction, Ethereum Ecosystem, and page titles) are capitalized, but sub sections on pages aren't.