Tired of sites, to which you will never navigate again, asking for your email just to provide you a piece of information? A lot of the spam email you receive daily probably has such an origin.
Mailinator to the rescue!
Just pick a random unique name, like 'zavarakatranemia', add '@mailinator.com' and use it as an email address! You can check the inbox with that name from the mailinator site!
Obviously, you do not want to email sensitive information there, because anyone who can think of the same random unique name has access.
It is a genius idea! I love using mailinator to obtain restaurant coupons. It is even funnier when the generated coupon includes the email address next to my name...