searchingmysoul, here is another reference on ego states that I like. It is all about Internal Family Systems Theory. It treats the self and its ego states as an internal family, and applies many of the techniques used in Family Systems therapy to this internal world.
http://www.selfleadership.org/ifsmodel.asp

These are the goals of internal family systems therapy:

A. To achieve balance and harmony within the internal system
B. To differentiate and elevate the Self so it can be an effective leader in the system
C. When the Self is in the lead, the parts will provide input to the Self, but will respect the leadership and ultimate decision making of the Self
D. All parts will exist and lend talents that reflect their non-extreme intention

Here's a brief article which contains an example of a visualization of ego states:
"Internal family systems therapy: a journey to healing & transformation"
http://www.articlearchives.com/crime.../922462-1.html