I would like to integrate a Q&A system or a forum with my rails 3 application. OSQA looks really good and seems to be exactly what I am looking for. Unfortunately it is in python and django. I am a newbie and I am not sure if such an application can be integrated with rails 3, I appreciate your comments on that.
You should manually connect sessions and authentication systems, it's good to make an API for connection.
Anyway, it's not "1-click task" so if you have no experience with Python, it's better to find something similar (maybe less feature-rich) for Rails. At least, you can always extend it if you need.