6 links
Algebraic Number Theory
numbertheory.org
A course by Keith Matthews. Lecture notes (GIF slides), bibliography, web resources.
Algebraic Number Theory and Automorphic L-functions
math.upenn.edu
Lecture notes by Ching-Li Chai, University of Pennsylvania.
Discriminant Exponent Calculator
public.asu.edu
Java applet computing the maximum exponent of a prime in the discriminant of a number field of given degree.
Multiplicities of Discriminants
algebra.at
Formulae and tables for the number of non isomorphic fields with a fixed signature and Galois group sharing a common discriminant.
Notes for Dick Gross' Algebraic Number Theory Course
math.uiuc.edu
Taken by Sean Sather-Wagstaff, Utah, Spring 1999. In PS and PDF formats.