Mail Goggles

I don't mind being an adamant Google fan, simply because they are one of the few organizations that not only does great work, but does fun work. Mail Goggles is one such example of Google implementing a functional, and fun, idea into their existing product.

The concept of Mail Goggles is mind-numblying simplistic: you can set your GMail account to give you a small test to see if you are 'awake enough' (as Google puts it) to send out an e-mail. After answering a few simple math questions, your letter will be sent. If, however, you have pounded back one too many, you'll be rather out of luck.
Don't worry if you hate the idea of always having to prove your sobriety when you send an e-mail: you can set Mail Goggle to activate on certain days at a specific time period.

Off the top of my head I can think of a few people who should this installed. Not me, of course. I never send drunken e-mails. (Except for two weeks ago -- however the bar had a computer in it! What am I supposed to do?)