Unlike most, this week's cool product pick really is cool! I finally had a chance to try out the Petzl Pirana rappel device that the UPS guy brought me. It's made to fit tightly on the Attache model carabiner also from Petzl which I already had. Unlike a traditional figure-of-eight, you can load the rope onto the Pirana without removing it from that carabiner, making it much harder to accidentally drop it. You can also vary the friction by routing one or both of the rope strands behind the two little ears on the bottom. In the photo, I'm using what Petzl calls "Fat-ass Mode" to get the maximum friction.