Global Directory of Mathematics Preprint and e-Print Servers - At the American Mathematical Society.

WWW Virtual Library: Preprints - At Florida State University

Mathematics Information Servers (Penn State) - Has a long list of journals and a list of preprint servers.

Math Resources on the Web (U Florida) - All on one page, including extensive preprint and journal sections.

Mathematics Journals on the Web - Lists print and electronic journals.

CW : A Bibliography of Collected Works of Mathematicians - By Steven W. Rockey, Cornell University.

Mathematics E-Journals - Compiled at the Kresge and Cook Libraries, Dartmouth.