I was at a friend's house and watched him open up a fresh pomegranate. Not only was it a complete mess, he wasted about 50% of the fruit by squishing it and cutting into it improperly. Pomegranates don't come cheap! Here's how to open them up quickly and not squish a single seed. Wear gloves and have a huge bowl to catch the seeds.
To easily seed a pomegranate, get a large bowl and fill it with water. Cut the pomegranate in half. While the pomegranate is submerged, proceed to seed the fruit underneath the water. This will prevent it from splattering.