Can't wait for someone to build a "Deploy to Heroku" button that I can stick on a GitHub README. It will spin up the app, do all the setup and then pass it off to the end-user; the instructions for most Heroku deployable apps always follow the same repeatable actions so it would be awesome to automate this.
I tried out this project with similar aims in the past: https://github.com/rainforestapp/heroku.json but it wasn't quite enough to get an app up and running.