I was searching tonight and looking for information on increasing my design skills and I stumbled across this little nugget – Email Warden. It takes the idea that American Express(?) had with disposable credit card numbers and brings it to email.
A lot of times you need to give an email address to register for something. With Email Warden, you can simply generate an email address alias that forwards mail to an address that you specify. When junk mail starts to appear, shut down the alias. What will they think of next??