Radical change, a theory described in Eliza Dresang's 1999 book, "Radical Change: Books for Youth in a Digital Age," was developed in the mid-1990s. It serves as a lens through which to examine, explain, and ultimately, use contemporary literature for youth growing up in the Digital Age. It identifies changes in forms and formats, perspectives, and boundaries in this body of literature--all changes related to the interactivity, connectivity, and access of the Digital Age. The Digital Age principles of interactivity, connectivity, and access that now characterize many books for youth are influenced by digital technologies and have altered the reading experience. Indicators of these principles in books include the following: graphics in new forms and formats; words and pictures reaching new levels of synergy; nonlinear or nonsequential organization and format; multiple layers of meaning from a variety of perspectives; cognitively, emotionally, and physically interactive formats; sophisticated presentations; abundant connections; and unresolved storylines. Manifestations of these and other indicators, however, have matured considerably in the ensuing decade and are continuing to appear in more and more sophisticated forms and formats, promoting more and more active engagement of the user/participant/reader, just as is happening with other dynamic media. In this reflection, Dresang describes some of the more dramatic developments in books and looks briefly to the future. She then discusses the implications of these changes for teacher education and for curricular applications and student learning.