Integrating Chef or Puppet with CF seems backwards, that only leads to vendor lockin.
Personally I'm using ruby-fog to automate the machine provisioning (alongside with puppet), which makes it easy to mix and match the resources from 6 Cloud providers in every imaginable way.
more power to you - its always the most flexible if you are using the lowest common denominator tool. My point in the post (if you read it) is that since we do use AWS, and have code to manage its specifics (which we have to do in fog as well) by abstracting the cloud resources into CloudFormation, our recipes get more portable. YMMV.
Personally I'm using ruby-fog to automate the machine provisioning (alongside with puppet), which makes it easy to mix and match the resources from 6 Cloud providers in every imaginable way.