A note on herbalism: while I am personally fascinated by it, I don't think I really endorse it beyond very limited applications like drinking mint tea if you're having stomach issues. Modern medicine is an improvement on herbalism and it does much better. I know a lot of witches and witchy types like herbalism.
Found an injured or orphaned wild animal? Check Animal Help Now for help. If you find a bird and it's a fledgling, it is not orphaned! They're being closely watched by their parents from a distance.
Crime Pays But Botany Doesn't: Really funny and cool guy talking about plants. He knows his stuff.
Botanical Society of Britain and Ireland: Plant Identification
Missouri Botanical Garden Plant Finder: Great for learning plant care.
Global Biodiversity Information Facility: Free, open access biodiversity data.
Botanical Dermatology Database
Plants for a Future: Plant Database Search: Various uses (culinary, medicinal etc.) for plants.
Thomas J. Elpel's Web World Portal
BlattaBase: The Cockroach Home Page
Featherbase: Feather research and identification
Insect, Bugs and Spider Identification
Falling Fruit: Find fruit trees/bushes near you.
Native Seeds: Plant native!
Eat the Invaders: Eat invasive species.
Opossum Society of the United States
Tomorrow's Trees: People-powered seed collection initiative.