I used Staticmatic, but I never liked having to move all my HAML/SASS over to my app. I recently replaced it with the showoff plugin [1], which is basically Staticmatic inside a Rails app.
Interesting, thanks, I'll consider using that next time I'm building a prototype that will eventually become a Rails app. But who knows, I might write a rails-app-exporter for StaticMatic just for fun :D