[bigbento]

Amazon's Elastic Beanstalk is a good compromise in this regard. I've been using it to develop some JRuby/Sinatra backend services, and though it's not quite as simple as Heroku, it's pretty close. Since the applications are just EC2 instances underneath the hood, you can tweak the server image quite a bit too, which is nice when you need to run some odd binary programs along side your web application. I haven't played around with Beanstalk's autoscaling feature yet, but that might come in handy for processing background jobs that fluctuate a lot.