If you search the internet all the time like I do, you often find yourself visiting a site that you want to view content on, then click the link, only to find that you need to sign yourself up. Which of course, means you sign yourself up for 2000 other ads sent straight to your inbox. Now that most of us have spam blockers, or at least bulk or spam folders, it's a bit easier, but.....for a while now, I've been using ten minute mail. It's awesome! It allows to sign up for an e-mail account just by clicking a link-- no filling out a form, or giving you your true e-mail! (They hate spam too!).
It's a real e-mail account! You can recieve and send messages just like a real one--but it only lasts for 10 minutes. After ten minutes your e-mail expires and you go back to having no account. Bye Bye spam!
http://www.10minutemail.com/10MinuteMail/index.html