Looks good already, and I haven't even been in.
The idea of currency and a bounty system kinda bugs me, but then again, I haven't been in.
Keep up the good work. ;)
EDIT: I just read lordicain's post. I agree with him. A suggestion that might fit what he is looking for is this: strip away the currency and the reward-part of the bounty system, but allow it to "mark" you down if you kill someone, that way it forces the killer to flee and become an nomad.
The currency just doesn't make sense because all of civilization has fallen, so currency is worthless. The only way of possessing items in a world like this is referring back to cultures centuries ago that used a bartering system.
Barting, to me, just makes more sense and better roleplay then having paper money that you can't really do anything with.