[cobrabyte]

I can't speak for others but I'm building a Rails app that could benefit from an Ember front end for a small subset of the full app. This series shows how easy it would be to 'plug in' Ember into a much broader Rails app.

If you're truly building a one-page style app, Rails is, as you say, probably not your first choice. Sinatra maybe?

[Argorak]

At the danger of plugging it everywhere: if you skip the "view-helper" part of Padrino, its a pretty good backend for sproutcore/ember (I use it as such).