Jane Austen Society of North America
http://www.jasna.org/
Benefits of membership include:
A subscription to the society’s newsletter, JASNA News, published three times a year, which carries book reviews, news from JASNA regions, and feature articles;
Persuasions, JASNA’s annual journal, a preeminent source for Austen studies, with essays from the Annual General Meeting (AGM) and scholarly articles.
The Republic of Pemberley
http://www.pemberley.com/
From the site's welcoming page:
We, all of us, remember only too well the great relief we felt upon discovering this haven for Jane Austen Addicts. If your eyes did not widen, if you did not gasp in recognition, if you did not experience a frisson of excitement when you discovered a whole campful of soldiers - er - a whole websiteful of fellow Jane Austen Fanatics, then this place may not be for you. We are The Truly Obsessed here and have been known to talk for weeks about Jane Austen's spelling quirks and Mr. Darcy's coat ("No, no - the green one.")
[This website may be the grand-daddy of all Jane Austen websites. It existed as a list-serv pre-dating the World Wide Web.]
Austen Blog
http://www.austenblog.com/
This one is marvelous "compendium of news about Jane Austen in popular culture." It is edited by Margaret C. Sullivan, author of The Jane Austen Handbook.
Regency Researcher
http://www.susannaives.com/nancyregencyresearcher/
"This site contains a wealth of information on topics not often covered in other places or more formal histories. It address those trivial topics which give a true sense of daily life, such as did mothers wear mourning for still born children, or how exactly did the law on marriages change over time. Moreover it is written in a lively and engaging manner." -- historical romance reader
Reveries Under the Sign of Austen
http://reveriesunderthesignofausten.wordpress.com/2010/12/
Professor Ellen Moody of George Mason University began a close reading of Jane Austen's letters with this blog entry in December 2010. She examines the contents of each letter against the background of events occuring when JA was writing it. You can add your voice to this discussion.
Jane Austen Society of the United Kingdom
http://www.janeaustensoci.freeuk.com/
Founded in 1940, this society was the inspiration for the North American, South American and Australian organizations to follow.
Chawton House Library
http://www.chawton.org/index.html
What an amazing place this is! And what a fun story about Dr. Lerner's adventures in getting it off the ground! This is the house that Jane's brother inherited and which is in the village where she lived the last years of her life. Be sure to check out their quarterly publication, The Female Spectator.