Metro Bonsai

Bonsai4me

Excellent Site which includes Bonsai Basics, Various Articles, Galleries, Species Guides, and Advanced Techniques

BonsaiTalk

Need to register for this site.  Contains a great forum to share information with other enthusiasts, articles, galleries, and more.  Highly recommended.

The American Bonsai Society

As a non-profit corporation founded in 1967, to promote knowledge of and interest in bonsai and to serve as a focal point for bonsai learning in North America.

National Bonsai Foundation

The National Bonsai Foundation is a section 501 (c) (3) nonprofit organization established in 1982 to sustain the National Bonsai & Penjing Museum.  It cooperates with the U. S. National Arboretum by offering financial support and advice to the Museum.