old_contents: var path = require('path'),
      express = require('express'),
      http = require('http'),
      mongoose = require('mongoose'),
      config = require('./config');
  
  var app = express();
  
  // Configuration
  app.configure(function(){
      app.set('views', __dirname + '/views');
      app.set('view engine', 'jade');
      app.set('view options', { layout: false });
  
      app.use(express.logger());
      app.use(express.bodyParser());
      app.use(express.methodOverride());
      app.use(app.router);
  
      app.use(express.static(path.join(__dirname, 'public')));
  });
  
  app.configure('development', function(){
      app.use(express.errorHandler({ dumpExceptions: true, showStack: true }));
  });
  
  app.configure('production', function(){
      app.use(express.errorHandler());
  });
  
  mongoose.connect(config.db.url);
  
  require('./helpers')(app);
  require('./routes')(app);
  
  http.createServer(app).listen(config.port, config.address, function() {
      console.log("Express server listening on %s:%d in %s mode", config.address, config.port, app.settings.env);
  });
  
new_contents: var path = require('path'),
      express = require('express'),
      http = require('http'),
      mongoose = require('mongoose'),
      config = require('./config');
  
  var app = express();
  
  // Configuration
  app.configure(function(){
      app.set('views', __dirname + '/views');
      app.set('view engine', 'jade');
      app.set('view options', { layout: false });
  
      app.use(express.logger());
      app.use(express.bodyParser());
      app.use(express.methodOverride());
  
  	app.use(express.cookieParser('your secret here'));
      app.use(express.session());
  
      app.use(app.router);
  
      app.use(express.static(path.join(__dirname, 'public')));
  });
  
  app.configure('development', function(){
      app.use(express.errorHandler({ dumpExceptions: true, showStack: true }));
  });
  
  app.configure('production', function(){
      app.use(express.errorHandler());
  });
  
  mongoose.connect(config.db.url);
  
  require('./helpers')(app);
  require('./routes')(app);
  
  http.createServer(app).listen(config.port, config.address, function() {
      console.log("Express server listening on %s:%d in %s mode", config.address, config.port, app.settings.env);
  });
  
subject: Add cookieParser and session to express setup