I’m still waiting for the breathaliser phone, but this is a good start from Google – Mail Goggles. Which once enabled forces you to do timed maths before you can send an email, thus tripping up Friday night ill-advised emailing. This would absolutely stop me, even without the drink the maths would take me ages!
Realistically there are flaws in the system, not least the a ton of other instant ways you can get on touch with people if you really decide you need to after a few g&ts. Still good old Google for creating something relevant to people’s real web use – and making us laugh.
Oh well, I’m getting an iphone soon, maybe they’ll invent an app or something.