The closest we were to this before was Paul Irish’s build script from the HTML5 boilerplate site. Now Yeoman does all of that and way more. Paul Irish is also involved in this project. Watch the video to get an idea of what I’m talking about:
I just spent two hours on this and got it working on Windows. Getting is working on a Mac is a lot simpler.
Here are the instructions for installing it on Windows.
This is very cool and I think you will love all the time it will save you.