The Palm Beach Palm and Cycad Society maintains an excellent list of links related to palms and cycads. See their list here.

Organizations

International Palm Society

Palm Talk (Excellent Forum created by the IPS)

Palm Beach Palm and Cycad Society

Central Florida Palm and Cycad Society

Palm and Cycad Society of Australia

Palm Society of South Texas

Fous de Palmiers (French Palm Society)

Botanical Gardens

Montgomery Botanical Center (Research Organization, not open the public except for specially arranged group tours)

Fairchild Tropical Botanic Garden

Mounts Botanical Garden (Located in West Palm Beach)

Naples Botanical Garden