The Corporate Standard of Compassion for Animals. Administered by the Coalition for Consumer Information on cosmetics, it is the most stringent certification for no animal testing, and is backed up by independently performed audits.
I look for the leaping bunny whenever I shop for personal care or household products. Want to know if a company whose products you use are certified? The Cruelty-Free Shopping Guide is available online or an an app for the iPhone or android phone.
Here's a short video that explains why you should choose cruelty-free: