The friendly ones:
-A nice page of vegetarian links.
-Our friends at Earth Matters! are better looking than you are.
Bordering on militant:
-What is the Meatrix? is a 10 minute long flash movie about why factory farms are bad.
Don't stand too close:
-People for the Ethical Treatment of Animals (PETA) is perhaps the largest animal rights activist group in the world, and perhaps the only one that includes Pamela Anderson. A notable (and graphic) video to watch is Meet Your Meat.
-For now, this fairly neutral take on the Bhagavad Gita will suffice.