My wife just found this device for me and I thought I'd share for those that haven't seen it.
This vid speaks for itself. The device attachment doesn't have to stick to the Playbook but can stick to any hard or gel cases. We just ordered it so haven't tried it out yet but it looks great. I have a disability so have a little trouble holding the tablet so looks perfect for me. Aside from that it looks as though it has many uses:
while I don't personally think I would use this. It is a great accessory for those who need it and it can add functionality to it depending on how sturdy it is.