Better than a static email address for spam. When you're given a coupon or free downloads, etc in exchange for an email address, just copy the email address provided, paste in into the freebie signup form, and wait for the confirmation email/coupon code/download link to appear.
After 20 minutes, the email address will self destruct Mission: Impossible style and neither you nor anyone will ever see any messages sent to that address ever again!
Email hasn't arrived and you need to dash to the store? Just hit "Add another 20 minutes" once or twice and you'll have time to take care of business and follow up with the email when you return.
Note: URL should point to: http://20minutemail.com/TemporaryEmail/tabid/55/language/it-IT/Default.aspx