As an example of components here's a link from official cookbook:  http://emberjs.com/guides/cookbook/helpers_and_components/creating_reusable_social_share_buttons/

Also it's worth mentioning kind of alternative option for components is boundHelpers... e.g. https://github.com/epicmonkey/pepyatka/blob/master/public/js/app/helpers/Handlebars.js#L25