Don't you hate how your dev machine inevitably becomes the superset of all the dependencies of every project you ever worked on? Nobody to live in a war zone of datastores fighting for resources.
Vagrant is suppose to help us with this. Package everything in virtual machines, and your life will be amazing! That's the idea at least; but the actual mechanics of getting to that promised land are not all that clear.
Freighthop is a new project that attempts to make it dead simple to get a Vagrant VM running your Rails (or Rack) app and all its dependencies.
In my 5m I'd give a quick overview of the project and then invite people to try it and/or help out.