For those of you who have asked for more details (that I should have provided to begin with...) We're a small company, about 40 employees and 15 developers. Th

For those of you who have asked for more details (that I should have provided to begin with...) We're a small company, about 40 employees and 15 developers. The app is written in Ruby on Rails 3 with MongoDB for the backend. It's designed to be run on a server and provides a JSON and XML based API for general-purpose reporting of user metrics in (web) apps. One of the main goals with open sourcing the app, from the company's perspective, is that they would like other people to fork and contribute back to the project. Any thoughts on what license might be best for those purposes? Obviously the GPL means that people have to publish their changes, but I wonder if that restriction might cause less adoption than using the MIT / BSD license to allow people to do whatever they want.