Results of the GREAT08 Challenge: An image analysis competition for cosmological lensing by Bridle, S, Balan, S, Bethge, M, Gentile, M, Harmeling, S, Heymans, C, Hirsch, M, Hosseini, R, Jarvis, M, Kirk, D, Kitching, T, Kuijken, K, Lewis, A, Paulin-Henriksson, S, Scholkopf, B, Velander, M, Voigt, L, Witherick, D, Amara, A, Bernstein, G, Courbin, F, Gill, M, Heavens, A, Mandelbaum, R, Massey, R