address save during checkout is done by _afterSave()-Method in customer resource model.

protected function _afterSave(Varien_Object $customer)
{
    $this->_saveAddresses($customer);
    return parent::_afterSave($customer);
}

as i remenber customer model get saved during order placement.

cheers

address save during checkout is done by _afterSave()-Method in customer resource model.

protected function _afterSave(Varien_Object $customer)
{
    $this->_saveAddresses($customer);
    return parent::_afterSave($customer);
}

as i remember customer model get saved during order placement.

cheers