okay, being a racer, my boots suck at keeping my feet dry, because performance comes first. and i'm in them for like 4-9 hours a day 5 or 6 days a week. i can't really help you get the stank out, the above entries look helpful. but this is the best ski advice i've ever gotten.
Never wear cotton socks skiing. These suck with moisture.
use waaaayyyy too much baby powder. load your socks up and inside your boot shells and liners. it will absorb all the moisture and help with the smell. it really helps if you like raid your grandmas house and get the old kind that gives you cancer if you inhale it, look for talc as the main ingredient. i keep a bottle in my car, ski bag, and in my locker. it helps so much.