It looks awesome so far! I'm really digging this series!
Quick question though: I don't use the d20 system, but I do use some OGL variants of it and I used to play Third Edition. Why do you not have the die types for Hit Dice listed with the creatures in the two books? Is that a 3.5 thing or...
Well, I have found theRPGsite so be pretty useful. It's mostly general discussion, but there are some house rules mixed in there, generally for old-school type games. House rules and homebrew settings for d20 are pretty common as well.