Ask YC: Which queue/background worker solution?

I want to distribute tasks across several servers and processes. I've found several solutions, but couldn't find any useful third party reviews. So can anyone recommend a good solution from their own experience?

Currently, I'm looking at:

- Scarling/Kestrel http://github.com/robey/kestrel/tree/master

- Gearman http://www.danga.com/gearman/

- RabbitMQ or any other AMQP solution (but that looks as overkill)

- rolling my own with REST or MySQL