ASSOCIATION FOR COMPUTATIONAL LINGUISTICS (ACL)
Natural language processing research and applications. 
Members receive the journal Computational Linguistics, ISSN 0891-2017.
Regular membership $40 ($25 full-time students not earning a regular
income; $25 for retired and unemployed), $10 extra for first
class/air postage in North America, $20 elsewhere. For more
information write to Association for Computational Linguistics,
PO Box 6090, Somerset, NJ 08875, or send email to acl@cs.columbia.edu.
Institutions must subscribe to the journal through MIT Press Journals,
55 Hayward Street, Cambridge, MA 02142, USA, phone 617-253-2889, fax
617-258-6779, e-mail journals-orders@mit.edu. 
To get information about the ACL listserver, send mail to
   listserv@cs.columbia.edu
with 
   index acl-l
in the message body. To get the membership form, include
   get acl-l membership-form.txt
in the message body. The ACL archive can also be accessed by
anonymous ftp from ftp://ftp.cs.columbia.edu/acl-l/. The ACL Web page is
accessible through the URL
   http://www.aclweb.org/

ASSOCIATION FOR MACHINE TRANSLATION IN THE AMERICAS (AMTA)
655 Fifteenth Street, NW, Suite 310, Washington, DC 20005
Membership: $40 Associate members, $65 active members, Institutional $200,
Corporate $400. Members receive the MT News International and the
MT Yellow Pages. 

SIGNLL is the ACL Special Interest Group on Natural Language Learning
(language acquisition and related topics). To join, send mail to
walter.daelemans@kub.nl or use the forms on the SIGNLL home page. For
more information, see the SIGNLL home page at the URL
   http://signll.aclweb.org/~signll/

See also the Cognitive Science Society.