Ember Learnings from Trek
Trek Glowacki has an excellent writeup clearly detailing how to build a simple Ember app up from scratch.
As of 9-2-12 it's available at http://trek.github.com
I decided to take those notes and build the app inside a Rails 3 app with ember-rails. This is that app. I hope you find it useful and give Trek a shoutout for putting together a really great resource.
Check out the result at http://ember-learnings-from-trek.herokuapp.com
FYI: it seems to have issues on mobile at the moment.