Links

Below are the newest and the best links I have found on this topic:

The American Dahlia Society - http://www.dahlia.org/

The Colorado Dahlia Society - http://www.dahlias.net/

Dahlia Culture, Pictures and Lists of Commercial Growers
http://www.ahs.org/

American Horticultural Society -- For horticulture beyond dahlias - http://www.ahs.org/

National Dahlia society (UK) - dahlias accross the pond
http://www.dahlia-nds.co.u/