Gods, but that sounds brilliant. Having a single toggle for non-essential cookies, even if it's on a site-by-site basis, would be a whole lot better than every website having it's own, different (and often highly dubious) way of handling things.

The cookie debacle has been going on for so long now, and is obviously not going away any time soon - surely there must have been draft RFCs or even W3C proposals along these lines at some point?