Few listen, fewer care...
All For Animals
American Association for Laboratory Animal Science
Center for Alternatives to Animal Testing
FRAME--Foundation for Replacement of Animals in Medical Testing
Friends-4-Life (an animal rights activist group)
On a good note, here's some links for animal preservation...
OWL--Operation Wildlife
Project Wildlife
That's all I have so far. Knowledge is the first step in any endeavor. No species has the right to determine whether or not another is worthy of living or not--particularly not man.