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Algebraic Number Theory Archives
http://front.math.ucdavis.edu/ANT/
Large linked preprint archives for papers in Algebraic Number Theory and Arithmetic Geometry up to the end of 2002.
ArXiv Front: NT Number Theory
http://front.math.ucdavis.edu/math.NT
Very large Number Theory section of the mathematics e-print arXiv.
K-theory Preprint Archives
http://www.math.uiuc.edu/K-theory/
Electronic preprint archives for mathematics research papers in K-theory. Includes some papers in algebraic number theory.