Here are some sites we recommend for more information about trees:
GoBotany - Want to know what that plant is? With GoBotany’s Simple Key, you can identify over 1,200 common native and naturalized New England plants!
The North Carolina Extension Gardener Plant Toolbox
Arbor Day Foundation - Inspiring People To Plant, Nurture, and Celebrate Trees.
US Urban and Community Forestry Program
My Tree - a tool for assessing the benefits of your individual trees