I present to you the future of the web forum:
Discourse
Discourse is a product by famous programmer (whom I respect a lot) Jeff Attwood. It is open source, written in Ruby on Rails (at last, a good Ruby forum!) and a JS framework. Most importantly; it's innovative.
The web forum has not changed much in, ooh, make that 10 years or so? At least.
This is a problem.
It is not easy to become a member of a forum. Bloated software like phpBB confuses users. I know a lot of people who can't get the hang of something as simple as displaying links as text in BBCode in a number of forums. The User Experience (UX) of a web forum has not developed at all as UX's have improved in all areas of technology.
Discourse solves this problem.

I won't say anything more; go to the website and click 'Try it'. I admit, I was sceptical at first, but I quickly realised (especially after making an account on their 'meta' page) how powerful and revolutionary this is. Browsing quickly through the forum for the latest posts has never been so easy. Neither has editing. Discourse, I can firmly say, it the future of online non-real time communication.
It feels great to know that this is open source and written largely in one of the nicest programming languages (and frameworks) there is, using the brilliant (and open source) PostgreSQL database.
Without further ado, I can only recommend you try Discourse now or join in the conversation. You can also contribute to their code and art (smileys, etc) repository on GitHub if you have the skill.
Thanks for reading.