I've just picked up ansible, and one thing I found lacking was an example ansible repository with a standard directory layout and config documented on the site or on github. For example, it's not obvious from the docs that a nice way to set things up is:
I hadn't, doh! Thanks. Might be worth adding a link to that at start of the docs, because I found I was hesitant to start writing yamls without knowing the "right" structure for them.
Folks might be interested in checking out http://github.com/ansible/ansible-examples for some full-stack use cases showing playbooks that we do have.