This is a really great looking start. I can say that this is a real pain point with the work that we do in Drupal. I currently insist that all the dev work we do be done on the dev server but having an easy way to rollout to live would be wonderful! Also, having a way to roll back changes would be great. That way if you see that the new changes screwed up something, you could quickly revert the changes.

I'll be interested to see how this goes.