Course Notes by Jim Milne - Algebraic number theory, Class field theory, Algebraic Geometry, Elliptic Curves, Modular functions and forms, Abelian varieties, Etale Cohomology. TeX, DVI, PS and PDF..
Math Courses at UIC - Course handouts, lesson plans, and other resources compiled by Dan Bernstein..
Mathematics Practice - Explain what prime numbers are and give examples of how learning them can help with math. Provides many free exercises to download, and a book and game to purchase..
Paul Garrett's Lecture Notes - With exercises and course material. Topics include Algebraic Number Theory; Automorphic (Modular) Forms, Representations, L-functions..