Gelis-SPhT-2006: "High energy hadronic interactions in QCD and applications to heavy ion collisions" (I: Introduction and phenomenology - II: Lessons from Deep Inelastic Scattering - III: QCD on the light-cone - IV: Saturation and the Color Glass Condensate - V: Calculating observables in the CGC) Gelis-SPhN-2005: "Introduction to the theory of the QGP and the CGC"