I use Celery myself as well and it's awesome.

It supports multiple messaging queues and backends for storing results (RabbitMQ, MongoDB, AMQP, Redis, ... - I personally use Redis, because I don't need all the features and overhead from RabbitMQ) and also has a great documentation and friendly support on IRC.

And if you watch the Celery project on github you can see that the author is basically working and improving the project on daily basis.