I've noticed a couple threads talking about catch and release. When I was helping with the DOW kids fishing tank at the Sportsmans Expo they were using self releasing hooks. These things were pretty kewl on a couple of deep hooked fish, I simply pulled the line and itspun the hook inside the fish and slid right out. I havent picked any up yet but I plan on getting some, it took me a while to find them on the net to show you guys, here is a picture of them and how they work. I dont know if this is the same brand the DOW was using or not. But it was the same style.
http://www.sheltonproducts.com/newcirclehook.html


http://www.sheltonproducts.com/newcirclehook.html