AdSense® for domains allows domain name registrars and large domain name holders to unlock the value in their parked page inventory
it's not allowed to use adsense with a parked domain (if you are not premium publisher like sedo.com)
sedo.com sedo says that they use google advertisings i have noticed it and they realy use google advertisings, if there is adult keywords then they go for adbrite! here is my site parked on it unlimitedmasala.com