Anyone ever brought up the idea of listing the creature type under the creature heading or name? Example: BugBear (Goblinoid) Skeleton (Undead) Bear (Animal) that sort of thing. Just so everyone is aware of the creature type there fighting in each battle. I know you guys got enough to worry about, but it might be a good addition.
A better way would be specifying in the feat's description which type incorporates which creatures. Besides, it might spoil a few things like revealing info on Outsiders concealed in human form.
Sounds like a job for knowledge skills Players aren't meant to get access to the Monster Manual and DMG in-game, only the PHB, so no, we really shouldn't give that information out in-game. You can always check the SRD, or protos.tab, at other times.
I knew most enemy types, but I was not familiar with outsider, I see how its abyssal planes and demonic creature types, right? Still learning its just I've got this game to finally catch my girlfriends eye but she's not familiar with enemy types. New comers could use more of a hand.