Slightly heavier, but a good option if your stoker is nervous on clipping in initially, (or you ever want to use street shoes) is the shimano SPD A530 pedal. It looks good and works well. Later you can upgrade to an XT or XTR for the weight weenie route and put those pedals on your commuter or Latte bike. 8 degrees float is what you get with SPDs and it's enough for most people if the cleats are positioned right, but if you want more, the Frogs have it. I would get set up on a trainer either at your LBS (I think Serotta make a system specifically for aligning the cleats correctly) or with some borrowed pedals and test the pedal/cleat/shoe system before you commit if possible. A few minutes is probably enough.