This is essentially using your smartphone as a SecurID dongle, right? That seems well accepted as good security, so it's surprising so many people are down on it when Google gets involved. (Or not really surprising at all.)

What's funny is that the gamification on StackExchange ends up adding cruft to the interface. Like how every single user's score and badge count is shown to every other user, along with a significant amount of screen space being dedicated to question and answer and comment scores and the arrows to change them.

Thanks for the link to the small carabiner. That seems a bit more practical than my "normal" sized one, considering mine is basically just an empty ring of metal taking up space in my pocket.