I'm using Brunch[1] for a current project, and have used Backbone Boilerplate[2] in the past. Brunch is pretty great, though bbb is better hooked up with requirejs out of the box, if you're into that kind of thing.

I really want Yeoman to take off, in particular because I really want one of these tools to become the breakout hit. I'd rather everyone be focusing on improving one tool instead of all this effort going diffuse across a bunch of different solutions. I'm a python dev, and I thank the stars that pip became so standard. (Not that this is a direct analog to pip, but pip provides a subset of this functionality when it comes to packaging.)

One note: the Ember init is waaaay basic. I know that these are going to be community maintained, but I would have hoped that the Ember generator bundled with this initial release would have included at least commonjs or requirejs integration.

[1]http://www.brunch.io [2]https://github.com/tbranyen/backbone-boilerplate