Chazzanut Online:Comprehensive site on Chazzanut. Contains original sheet music by cantor Yossele Rosenblatt, Isaac Heymann, and Abraham Katz. Offers a selection of traditional Dutch synagogue tunes (Nusach) with midi audio, archive with articles from Dutch pre-war newspapers, and background information on tunes including Max Bruch's Kol Nidrei and the Maoz Tzur.
Bazian, Moshe: Videos and MP3s of concerts from this chazzan.
Kol Tefilah Choir: Information about and RealAudio samples of this Jewish liturgical choir.
Modzitz: The Modzitz chassidim are renown for their beautiful tunes. This site features a large MP3 collection of these nigunim.
ShulMusic: Complete sheet music collection of Salomon Sulzer as well as the Bluebook anthology of English chazzanut.
ShulMusic List: Chazzanut email list and Yahoo groups site.
Transliterated Siddur: A phonetically transcribed siddur by Jordan Wagner. For those that wish to participate in a traditional service, but cannot read Hebrew.
Zamir Chorale of Boston: Non-profit mixed chorus who perform of Jewish choral music. Includes schedule, press clippings, recordings and biography.