American Forests - See the National Register of Champion Trees.
Delta Database - It's a great source for photomicrographs showing wood anatomy.
Foresthistory.org - A great site that shows up to 30,000 photos of mostly American forestry in the early days.
FSC-Watch - A good idea has morphed in the certification of "green deserts".
International Wood Collectors Society (IWCS) - Founded in 1947, the International Wood Collectors Society is a non-profit Society devoted to distributing information on collecting wood, correctly identifying and naming wood specimens, and using wood in creative crafts.
The American Woods - Exhibited by actual specimens and with copious explanatory text by Romeyn B. Hough.
US Forest Products Lab Center for Wood Anatomy Research - They can ID wood for anyone.
Useful Tropical Plants - The Useful Tropical Plants Database contains information on the edible, medicinal and many other uses of several thousand plants that can be grown in tropical regions.