CW : A Bibliography of Collected Works of Mathematicians: By Steven W. Rockey, Cornell University.
Global Directory of Mathematics Preprint and e-Print Servers: At the American Mathematical Society.
Math Resources on the Web (U Florida): All on one page, including extensive preprint and journal sections.
Mathematics E-Journals: Compiled at the Kresge and Cook Libraries, Dartmouth.
Mathematics Information Servers: Lists electronic and printed journals. Maintained at Penn State.
Mathematics Journals on the Web: Lists print and electronic journals.
MathNet: Mathematical Publications: Lists journals and bibliographies, preprint archives and other information providers.
WWW Virtual Library: Preprints: List of preprint servers, by subject and institution. From Florida State University.