Youtube deseed a pomegranate and you'll get lots of videos - I combine two techniques, spanking & a bowl full of water. But I'm not sure if the bowl of water is necessary.
I like this pomegranate spanking video best...
Martha Stewart also has a video about "banging" a pomegranate. She is adamant about "banging" it, not spanking it. Maybe she thinks spanking a pomegranate is more offensive than banging it. To each their own. The most interesting thing about her video is her co-host, you can find the video is here.
Maybe you already know this, but since we're on the topic of fruit, here's how to slice a mango. We buy the yellow skinned ones - like butter. I'm not sure this is my favorite mango cutting video (this one is spicy and funnier) - but I linked up to her weelicious.com website and it was a good find!