ChoralNet http://www.choralnet.org/
Comprehensive website materials about all aspects of choral musicianship.
Wisconsin Musical Groups http://my.execpc.com/~regent/
Listing of practically all community and professional performing groups in Wisconsin.
Choral Public Domain Library http://www.cpdl.org/
Extensive collection of free, printable choral music in the public domain.
Musica http://musicanet.org/
Sesrchable database with info about choral music that is available worldwide.
Silvis Woodshed http://www.channel1.com/users/gsilvis/
Collection of MIDI files of choral music standards for use as an aid in learning parts.