For printing Postcards:
http://www.jakprints.com
http://www.1800postcards.com
http://www.modernpostcard.com

Arts consultant Jeffrey James http://www.jamesarts.com

Publicist Ariel Hyatt, "How to be Your Own Publicist,"
http://www.arielpublicity.com

Quintet of the Americas http://www.quintet.org

For posting press releases to large group of music professionals:
Musical America http://www.MusicalAmerica.com
Music Industry News Network http://www.mi2n.com
Billboard Publicity Wire http://www.billboardpublicitywire.com/

Posting concert information:
http://eventful.com
http://upcoming.yahoo.com
http://www.jambase.com

Posting to the media outside of music:
http://www.24-7pressrelease.com
http://www.PR.com
http://www.PRlog.com