peepcode.js

App.Router.map(function() {
  this.resource('tables', function() {
    this.resource('table', {path: ':table_id'});
  });
});

trek.js

aContributor: Ember.Route.extend({
  route: '/:githubUserName',
  connectOutlets: function(router, context){
    router.get('applicationController').connectOutlet('oneContributor', context);
  },
  serialize: function(router, context){
    return {
      githubUserName: context.get('login')
    }
  }
})