The previous version of this Gist wasn't up to date anymore with the latest version of autoNumeric (1.9.17). Not saying this works perfectly, but first tests show that it does work.

knockout.autonumeric.js

ko.bindingHandlers.autoNumeric =  {
    init: function (el, valueAccessor, bindingsAccessor, viewModel) {
        var $el = $(el),
            bindings = bindingsAccessor(),
            settings = bindings.settings,
            value = valueAccessor();

        $el.autoNumeric(settings);
        $el.autoNumeric('set', parseFloat(ko.utils.unwrapObservable(value()), 10));
        $el.change(function() {
            value(parseFloat($el.autoNumeric('get'), 10));
        });
    },
    update: function (el, valueAccessor, bindingsAccessor, viewModel) {
        var $el = $(el),
            newValue = parseFloat(ko.utils.unwrapObservable(valueAccessor()), 10),
            elementValue = parseFloat($el.autoNumeric('get'), 10),
            valueHasChanged = (newValue != elementValue);

        if ((newValue === 0) && (elementValue !== 0) && (elementValue !== "0")) {
            valueHasChanged = true;
        }

        if (valueHasChanged) {
            $el.autoNumeric('set', newValue);
            setTimeout(function () { $el.change() }, 0);
        }
    }
};

Very useful!