Card based package for distributing electronic media and services

A method of rendering a wrap package of cards using a runtime viewer executing on a computing device, the runtime viewer including a multiplicity of behavior definitions, the method comprising:

• requesting and receiving a wrap descriptor that defines a structure, layout and content of the wrap package of cards, the wrap descriptor including a set of card descriptors, each card descriptor being arranged to define the structure, layout and content of an associated card, wherein a first one of the card descriptors includes a first behavior declaration associated with the associated first card or a first component of the associated first card, the first behavior declaration identifying a first behavior to be associated with the first card or first component;
• creating a runtime instance of the wrap package on the computing device based on the wrap descriptor using the runtime viewer, the runtime instance including a set of cards defined by the set of card descriptors, wherein the runtime viewer associates the first behavior identified by the first behavior declaration with the first card or the first component by binding a corresponding one of the multiplicity of behavior definitions to the first card or the first component.

A method as recited in clam 3, further comprising rendering at least one of the cards associated with the runtime instance on a display associated with the computing device, wherein the runtime viewer is arranged to initially render a selected initial card and to thereafter sequentially render selected additional cards responsive to user inputs.