don't try to listen to a port twice :P

app.js

@@ -29,7 +29,7 @@
     return res.render('index');
   });
 
-  app.listen(3000);
+  app.listen(process.env.PORT || 3000);
 
   console.log("Express server listening on port %d in %s mode", app.address().port, app.settings.env);
 

src/app.coffee

@@ -1,5 +1,4 @@
 # Module Dependencies
-
 express = require 'express'
 app = module.exports = express.createServer()
 
@@ -26,7 +25,6 @@ app.get '/', (req, res) ->
 
 
 # Set port and start server.
-app.listen 3000
 app.listen process.env.PORT || 3000
 
 console.log "Express server listening on port %d in %s mode",