There is an article in the winter 2006 issue of Children & Libraries about digital storytimes. A research project was taken in Chicago with four-year-olds. It’s interesting in the concept and findings. Take a look.
You can find the article in Ebsco’s Academic Search Elite database in pdf format.

Here is the citation:

Collen, Lauren (2006). Digital and traditional storytimes reseach project: Using digitized picture books for preschool group storytimes. Children & Libraries: The Journal of the Association for Library Service to Children. 4, 8-18.