Edit in JSFiddle

<h3>Products</h3>

<ul>
    <li><strong>Here is a static header item</strong></li>
    <!-- ko foreach: products -->
    <li>
        <em data-bind="text: name"></em>
        <!-- ko if: manufacturer -->        
            &mdash; made by <span data-bind="text: manufacturer.company"></span>
        <!-- /ko -->
    </li>
    <!-- /ko -->
</ul>

function appViewModel() {
    this.products = ko.observableArray([
        { name: "XBox", manufacturer: { company: "Microsoft" } },
        { name: "PlayStation", manufacturer: { company: "Sony" }  },
        { name: "Banana", manufacturer: null },
        { name: "Wii", manufacturer: { company: "Nintendo" }  }
    ]);
};

ko.applyBindings(new appViewModel());