INTERNATIONAL NEURAL NETWORK SOCIETY (INNS)
Membership is $55/year for non-students and $45/year for students, and
includes a subscription to "Neural Networks", the official journal of
the society. 
INNS Membership, Suite 300, 1250 24th Street, NW, Washington, DC 20037
70712.3265@compuserve.com, 202-466-4667, fax 202-466-2888.
INNS Membership, P.O. Box 491166, Ft. Washington, MD 20749

INTERNATIONAL STUDENT SOCIETY FOR NEURAL NETWORKS (ISSNNets)
Membership is $5 per year.
ISSNNet, Inc., P.O. Box 15661, Boston, MA 02215  
See also comp.org.issnnet.

JAPANESE NEURAL NETWORK SOCIETY (JNNS)
Department of Engineering, Tamagawa University,
6-1-1, Tamagawa Gakuen, Machida City, Tokyo,
194 JAPAN
Phone: +81 427 28 3457
Fax:   +81 427 28 3597
URL: http://jnns.inf.eng.tamagawa.ac.jp/main.html

EUROPEAN NEURAL NETWORK SOCIETY (ENNS)
URL: http://www.ida.his.se/ida/enns/