As of December 18, 2006, there is a Handbook of Narrative Inquiry: Mapping a Methodology! This 750 page handbook is the first comprehensive resource for those who are interested in narrative research. I have not had a chance to review it, but I will in the upcoming months and post more of a reaction. You can pre-order it at Amazon, but given the $125 price tag, you may want to wait for or encourage the local college/university library to purchase a copy.
At this point, let me suggest that narrative inquiry provides a strong potential theoretical framework for the use of digital narrative and digital storytelling for and as research. If you are a graduate student interested in considering such possibilities, I encourage you to get a copy of Narrative Inqiry: Experience and Story in Qualitative Research by Clandinin and Connelly, published in 2004. I consider it to be a seminal text in the field of Narrative Inquiry, adding a measure of order and clarity to what seemed to be much more fragmented prior to the its publication.