I have yet to find a service as straightforward as Heroku. Cloudfront comes close... but i get the feeling especially when looking at the documentation that Heroku have really put in a lot of effort into making a simple to use application platform.
But their new beta pricing of pay per hour per unit of memory is a lot nicer.
https://openshift.redhat.com/community/developers
We also love involvement - good, bad and ugly as well ;)