Theme: Disposable E-Mail Addresses
At the New Year, I registered a new Yahoo Mail account specifically for registering web service accounts. Yesterday, I received thirty-three piece of junk mail, with the filter activated! The moral of this story: never give out your actual e-mail address. Use one of these services:

http://www.jetable.org/en/index - Creates an email account that forwards e-mail to your personal address for one to eight days. Not annonymous, records are kept to protect against criminal use. No confirmation required, making this the quickest to setup.
http://www.mailexpire.com/ - Creates an email account that forwards e-mail to your personal address for twelve hours to three months
http://www.mailinator.com/mailinator/Welcome.do - Creates open email accounts, that you log into from the main page, with no sign up or password to remember. Each account can store only ten messages at a time.
http://www.mytrashmail.com/ - Creates open email accounts, that you log into from the main page, with no sign up or password to remember. Email is stored for 2 weeks in your account, which holds up to to 4MB.
http://www.spamex.com/ - Similar to SpamMotel, but requires a subscription fee.
http://www.spamgourmet.com/ - Creates an email account that forwards a set number of messages to you before expiring.
http://www.spamhole.com/create.html - Creates an email account that forwards e-mail to your personal address for one to seventy-two hours. You must confirm your address first.
http://www.spammotel.com/ - This is a program that you install. When you click on the SpamMotel icon on your desktop, a box pops up that lets you type a reminder note to remind you why and to whom the e-mail address is being given. SpamMotel then records this reminder note, and logs the date and time. As soon as our server has recorded this information (almost instantly), it creates a special e-mail address for you to give out instead of your real one. Simply paste this special address into whatever field requires it. You're all set; you don't need to do anything else. You can review all the reminder notes you've created on a special Log Page that we give you. Reminder notes can be sorted, searched, and even edited.

Edit: PookMail.com provides a disposable email address. that's cleaned out after twenty-four hours.