Some Useful Links:
YIVO Institute for Jewish Research
www.yivo.org
National Yiddish Theatre - Folksbiene
www.nationalyiddishtheatre.org
The New Yiddish Repertory Theater
www.newyiddishrep.org
Forward (Forverts)
www.forward.org
The Thomashevsky Project
www.thomashevskyproject.org
Congress for Jewish Culture
www.congressforjewishculture.org
American Society for Jewish Music
www.jewishmusic-asjm.org
The Tenement Museum
www.tenement.org
The Jewish Women's Archive
http://www.jwa.org/encyclopedia/article/yiddish-theater-in-united-states
CYCO Books
www.cycobooks.org