One of the most interesting and useful concepts I came across recently is the concept of a free service offering temporary email id’s.
In the words of the site itself "Why would you use this? Maybe you want to sign up for a site which requires that you provide an e-mail address to send a validation e-mail to. And maybe you don’t want to give up your real e-mail address and end up on a bunch of spam lists. This is nice and disposable. And it’s free. Enjoy! "
Now why didn’t I think of this before 😉