I have tried both Twitter 1.x and Zurb with Ruby on Rails and I found Zurb to be easier to use and have a better structure internal structure, easier to customize, etc
http://duologue.me is a new way to create and publish conversations. Think of it as a "blogging for two" where you and your friend collaborate to create new content.
It would be great to try it with ~50 beta testers at this point. Mostly to see if the idea has legs. See http://duologue.me/roadmap for more details. I'm also looking for a couple of people who want to help (RoR engineer and Designer) move this project along. The app is built with Mongo, Rails3 and Heroku.
Please drop me a line at 'zepplock (at) vova.org' if you need more information. You can also invite me (zepplock) on Duologue.me and start a conversation on subjects like RoR, APIs, Russian Literature, Reef fishtanks or whatever ;-)