It's a good screencast, but I wasn't able to follow along using the ember starter kit I downloaded yesterday (errors). I'm sure the problem was something silly, but I'm not a js whiz like the rest of HN so I got frustrated and quit. Hopefully the glut of ember tutorials on the frontpage today will help.
It should work for you. I followed along with the screencast (Truly awesome stuff. Build a blog in under 30 minutes!? Amazing.) using the Starter Kit 1.0.0-RC.2 which is what you would've downloaded yesterday. Everything worked fine for me. Ah, except for the Ember Data component which initially caused me problems. Turns out you have to grab it from Git and build it yourself. I only found that out from the comments on the video where it was posted on YouTube. That said, once I followed the directions I found on YouTube and built Ember Data, everything worked great and went smoothly from there on out.
Here are the instructions for building Ember Data (from a random YouTube comment):
git clone git://github.com/emberjs/data.git
cd data
bundle install
rake
You need to have bundler installed for your version of ruby.
Then go to dist/ember-data.js and use that where it says "ember-data-master.js" in the video. Worked for me.
And if you happen to be running ubuntu 12.04, then keep in mind that apt-get install ruby-bundler will pull in the wrong version, so just install the ruby1.9.3 package, and install bundler, posix-spawn, therubyracer and execjs via 'sudo gem install'. After that the youtube comments work just fine.
Took me only 3 hours to figure it out being a total ruby noob. So easy.