These are the proceedings of a conference on modular forms from the autumn of 2006. The book contains 17 papers not necessarily related to the lectures at the meeting. The contributions cover a wide range of topics including Siegel modular forms (S. Böcherer, H. Katsurada and R. Schulze-Pillot; B, Heim; T. Ibukiyama; M. H. Weissman), mock theta functions (K. Bringmann), Jacobi forms (N.-P. Skoruppa), geometry of Abelian varieties and Jacobians (R. de Jong; R. Weissauer), non-commutative modular symbols (Y. I. Manin and M. Marcolli), the Petterson trace formula and Hecke eignevalues (A. Knightly and Ch. Li) and Galois representations and their applications to the inverse Galois problem (L. Dieulefait; R. Weissauer; G. Wiese). The book starts with an introductory paper on modular forms (B. Edixhoven, G. van der Geer and B. Moonen).