Drupal7 theming and template Inheritance - Aimee Maree Forsstrom

Where is that .class and .tpl coming from? and how has templating changed in Drupal7?
This talk provides a look at Drupal7 theme inheritance;
Discussion on why and how theme inheritance occurs within Drupal, the Drupal way of over-riding theme elements. Has a look into some key things which have changed in Drupal 7 templates.