This screencast shows how you can add information (properties) to the entities known by the Entity API module; in this case by adding the word list to the globally available "site" entity (which is not really an entity).

This screencast shows how you can access entity reference data in Rules, to have cool things happen. This screencast covers:

This screencast presents data types and the data selection method for input in Rules. This is the most important difference between Rules 1 (D6) and Rules 2 (D7).