Recently I was working with one of our valued Thoughtworkers on an application we were trying to not only develop in a sane way, but package and deploy to production with just as much sanity. The status quo seems to favour bundler on the development side, but RPMs on the production side (if you judge these decisions based on what developers and ops folk prefer, generally).

After a reasonable amount of WTFing, we actually managed to get it working reasonably well. If you have Ruby apps with gem dependencies and want to develop and push to production with equal ease I suggest you read the blog post on the subject by Philip Potter here: http://rhebus.posterous.com/rpm-ruby-and-bundler