Ok so this is a little eary for a review…mostly due to me not even owning this, but I think it deserves a mention until I do. This is the Short Cut Capo from kyser. You cannot buy it at your typical music store, but you can buy it from http://www.bos-capos.com/instructions.html . It is widely used by Rick Cua, Chris Tomlin, Phil Keaggy, and Brian Doerkson. It holds down 3 strings and allows you to play interesting full open chords. By adding another regular capo 2 frets behind The player is able to change key easily.
So there you have it. Something that has been around for a while but not a ton of people use yet. Those who do swear by it. I will let you know how well it works when I get one in the next few weeks