Display number of times content is referenced in content
This video series helped me an infinite amount: http://vimeo.com/33251051, http://vimeo.com/33252553.


Make sure Child has an entity reference to Parent.
Create a new view
In Filter Criteria, add a new Type (= Parent)
In Advanced>Other, set Aggregation to YES
In Advanced>Relationships, add a new relationship for "A bridge to the Content entity that is referencing Content via field_parent" where field_parent is your entity reference. Call this "Parents"
In Fields, add Content: Title and when prompted set its Aggregation type to Group results together
In Fields, add Field: Parents and when prompted set its Aggregation type to COUNT (Distinct)
Ta-da