Here are the top resources I've found so far on AngularJS and CoffeeScript, with publication dates. Things are moving fast with AngularJS and there are a lot of outdated questions and answers on Stack Overflow, so you should always carefully check dates and versions when researching. For example, just a few months ago you couldn't use CoffeeScript classes as AngularJS controllers, but nowadays, as shown in this jsFiddle, you can!
Probably the most highly-linked article is Alexander Hill's CoffeeScript and AngularJS (July 2013).
Of course, if you want the latest and greatest Gruntfile for your AngularJS project, you should probably generate it with Yeoman.
Unfortunately, Yeoman Testing With Coffeescript is just a short post that should probably be retitled, since it's just focused on an issue related to Karma configuration.