This might work for the simplest of sites like some have pointed out (e.g. a blog) but what I can't accept is having application logic on the frontend. Beyond a

This might work for the simplest of sites like some have pointed out (e.g. a blog) but what I can't accept is having application logic on the frontend. Beyond authentication (let's say OAuth et all solve that issue down the road), one of the benefits of having serverside code is that when it comes down to it, you as a developer don't care if the user messes with the frontend (exposed) business logic (usually form validation of some type) because you're always checking it again / cleansing it on the serverside. That's the tip of the iceberg...ranking algorithms, limits on certain activities (rules in general). Now, that serverside code can be javascript serverd on something akin to 10gen if javascript is their tool of choice, but exposing any of those to the user so that they may edit them without any secondary sanity check is unacceptable.