PETA (People for the Ethical Treatment of Animals) makes up for its sometimes offensive tactics by it’s huge financial support from the Hollywood rich. There’s an interesting and largely persuasive (to me who is already persuaded) interview with PETA vice president Dan Mathews now available online.
But I was converted to the cause by Peter Singer. Apparently as was Richard Dawkins. Links are to online articles of an interview with Singer and a review of Singer by Dawkins.