Every one of us has been in that bind where a site or service will ask you for your e-mail address and you just don’t want them to have it cause you’re tired of junk mail.
Guerrilla Mail is free service that will answer your calls; it will create a timed 15 minute temporary e-mail account for you to use including a temporary mailbox that only requires a refresh to check it. Once you get your e-mail from the site you have signed up for, save the information and let your account time out. No more spam 🙂
If you need a little more time to wait you can click a link for an additional 15 minutes added onto your timer. This is a great service I expect I will use frquently and in the name of spam so will you.
… I have done a review on disposable, temporary email addresses , check it out.
goldcoaster 
Although it’s a good defense against spam, the Data Retention Directive (2006/24/EC) might put an end to these services in Europe.