AJR Newslink: Magazines
http://newslink.org/mag.html

Internet Public Library Online Magazines
http://www.ipl.org/div/serials/

Directory of Open Access Journals (DOAJ)
http://www.doaj.org/

U.S. Government Periodicals on the Web
http://www.lib.auburn.edu/madd/docs/
govperiodicals.html

Openly Jake
(find abbreviations and publication information)
http://jake.openly.com/

Journal Abbreviation Sources
http://www.public.iastate.edu/
~CYBERSTACKS/JAS.htm

PubList: The Internet Directory of Publications
(information about more than 150,000
magazines, journals, and newspapers)
http://www.publist.com