9. A system comprising: a digital object embodied on a computer-readable storage medium; a tag associated with the digital object and embodied on the computer-readable storage medium, wherein the tag includes a property that associates a strongly typed variable with the tag, wherein the tag is configured to associate a changeable property with the strongly typed variable, the strongly typed variable including a unique ID, the changeable property being a name, and wherein different names associated with a same unique ID are automatically resolved to the same unique ID independent of a user resolving the different names; and code embodied on the computer-readable storage medium configured to present the tag in a navigation tree that comprises a tag node expandable to expose a list of previously created tags, the code further configured to use the tag to present multiple user-selectable communication options to the user that the user can select, via a cursor, to cause initiation of a communication with a tagged entity, responsive to the user interacting with the digital object.
9. A system comprising: a digital object embodied on a computer-readable storage medium; a tag associated with the digital object and embodied on the computer-readable storage medium, wherein the tag includes a property that associates a strongly typed variable with the tag, wherein the tag is configured to associate a changeable property with the strongly typed variable, the strongly typed variable including a unique ID, the changeable property being a name, and wherein different names associated with a same unique ID are automatically resolved to the same unique ID independent of a user resolving the different names; and code embodied on the computer-readable storage medium configured to present the tag in a navigation tree that comprises a tag node expandable to expose a list of previously created tags, the code further configured to use the tag to present multiple user-selectable communication options to the user that the user can select, via a cursor, to cause initiation of a communication with a tagged entity, responsive to the user interacting with the digital object. 12. The system of claim 9 , wherein the strongly typed variable comprises a people type variable that associates the tag with a person or group of people, wherein the tag is configured to be used to provide at least one or more of email functionality or instant messaging functionality, and wherein the people type variable associates the tag with the person or group of people by associating the unique ID with the tag.