Celery and RabbitMQ issue

Celery and RabbitMQ issue

I'm following the instructions for Celery to get it working on my Ubuntu
13.04 install. Once i've installed celery and rabbitmq I try to run the
example code:
from celery import Celery
celery = Celery('tasks', broker='amqp://guest@localhost//')
@celery.task
def add(x, y):
return x + y
then
celery -A tasks worker --loglevel=info
this returns:
[2013-09-04 22:28:39,226: WARNING/MainProcess] celery@acer ready.
[2013-09-04 22:28:39,240: INFO/MainProcess] consumer: Connected to
amqp://guest@127.0.0.1:5672//.
Where I'm left with a flashing terminal cursor, commands I input return no
response and the only thing to do is CTRL-C out of it.
Any ideas where I might be going wrong?