title: Rabbitmq or Gearman - choosing a jobs queue
body: <p>At work, we need to build a jobs server for things like sending emails, building PDFs, crunching some data, etc.  Obviously, we'd like to build on some sort of generic queueing system. I'm familiar with Gearman, and that this is exact problem that it tries to solve: putting jobs on a queue where workers come to pick them up.  However, I'm seeing lots of mentions of Rabbitmq and am unclear how it's used in this scenario. </p>
  
  <p>Is Rabbitmq a good framework to build a distributed jobs system on top of?  </p>