This is Joe from the Healthy Games panel. I used a Fitbit, until I lost it. I just got the Fuelband. What I found with both is that they are helpful to gauge level of activity ("it's noon and I only have 1000 steps, move!"), but lack a second gear. What I'd love to see in products like these is a coaching feature - If my goal is to lose 10 pounds, how much more do I have to walk?
It would also be great to see a similar thing in Fitocracy. I have no idea how to start with lifting. Your UI is really nice, but assumes I have a plan. Pre-populating it with a starter plan would be a huge step forward. Same for Nike and all these other products.