Technological Pedagogical Content Knowledge (TPCK) attempts to capture some of the essential qualities of knowledge required by teachers for technology integration in their teaching, while addressing the complex, multifaceted and situated nature of teacher knowledge. At the heart of the TPCK framework, is the complex interplay of three primary forms of knowledge: Content (CK), Pedagogy (PK), and Technology (TK).
The Handbook of Technological Pedagogical Content Knowledge for Educators (TPCK) is now available via wiki. Looks like some excellent resources and research articles here.