Preface. Accretion Disk Theory: From the Standard Model until Advection; G.S. Bisnovatyi-Kogan. Accretion Disks around Black Holes: Twenty-Five Years Later; S.K. Chakrabarti. Viscosity in Accretion Disks; P.J. Wiita. Shock Formation in Adiabatic Accretion Flows around a Kerr Black Hole; J.-F. Lu. Rotating Accretion Flows near a Black Hole: A Numerical Study; D. Ryu. Simulations of Shocks with Smoothed Particles Hydrodynamics Method; D. Molteni, et...