That's a great idea! I work at Cloud 66 (http://www.cloud66.com) and we let you build your own Heroku on Azure and benefit from this $500k and Heroku-like simplicity. You can also migrate between cloud providers (including Azure and the ones mentioned) if needed.

We think this is a great way for startups to use the tons of cloud credits they get, instead of letting them go to waste or spending precious time on setting up infrastructure.