http://www.law.cornell.edu/topics/admiralty.html
Contains an overview of admiralty law, as well as links to federal, state, and international materials.

Seamanship International

http://www.seamanship.co.us/seamanship/admiralty.htm

provides free listing of all UK marine statutes in force.  Also had detailed information on international admiralty law.

http://www.mctf.com/
Maritime Cabotage Task Force- lots of information on the Jones Act

http://www.admiraltylawguide.com
A Guide to admiralty web sites with an emphasis on the laws of the United states. Flags sites that are notably comprehensive. Still under construction, but lots of annotated information.

Morgan's Shipping Case Index

http://www.morgans-law.com/

a reference guide to over 1000 selected English Court decisions together with links to other useful websites.  Published by a small British admiralty firm.

http://www.nocall.org/maritime.htm
Northern California Law Librarians site, heavy on California information, but also more general links.

http://www.admiraltylaw.com/links.htm
Maintained by an attorney in a Canadian law firm; includes insurance links and shipping site information

http://www.lawlib.uh.edu/Libraries/Bibliography/admiralty.html
John R. Brown Admiralty and Maritime Collection Bibliography. A very long list of titles held by University of Houston Law Library. Arranged by topic.