For the project we are working on for Teachers Without Borders we need a reliable asynchronous way to process tasks. There are a myriad of ways to do this and if you aren't careful you'll spend weeks second guessing yourself while investigate every possible option. Not that I would know that from experience.
There are a few blog posts around that describe how to get stuff up and running. Other than that the documentation is a bit sparse. I have to believe that will change over time. I am throwing my own links and experience into the mix so I don't forget how to do this.
First get the gems you need to run starling:
sudo gem install starling sudo gem install memcache-client
Get the working plugin
Get starling and working going with:
Fire up starling - this isn't in daemon mode. Add a -d for that.
starling -P tmp/pids/starling.pid -q tmp/starling
Next fire up the server
Get workling going
A few more resources