The Gesneriad Reference Web This site includes information, articles, links and images (about 1000) to Gesneriads, which include Saintpaulia, Gloxinia, Streptocarpus, and a host of other genera. Image pages are beautifully organized, arranged by genus and topic. Small thumbnails link to half-page, full-format photographs with frequent close-up links.
Gesneriasterna site this is a Swedish gesneriad organization.
The American Gloxinia and Gesneriad Society
Gesneriads Information on the plant family to which African Violets and Florist Gloxinias belong
Gesneriphiles, the electronic gesneriad mailing list
The Gesneriad Research Foundation has information about gesneriad seminars and collecting trips.
Wallace Wells' gesneriad web page.
Gesneriad Image Reference Ron has put up 155+ high res images of gesneriads.
The Gesneriad Reference Web A wonderful site dedicated to gesnariads.  Many photographs, and articles about all gesnariads (including African violets).
The Smithsonian Institution's Museum of Natural History Web site includes an extensive gesneriad bibliography, among other fascinating topics.
The Families of Flowering Plants - Gesneriaceae Cornell University
Wallace Wellsí Gesneriad Page
Gesneriads for the Florida Gardener provides cultural information applicable to all climates.
AGIS database here you can find out about ethnobotany and gesneriads.
The Gesneriasts of Sweden, an AGGS chapter, provides this Swedish language page (with English translations), includes photographs.
Descriptions of over 400 gesneriads By David & Colleen Turley

CrossWords, a newsletter published by the Gesneriad Hybridizers' Association.