Two new EMail related extensions.
Gish It. GishPuppy offers disposable email addresses that automatically forward messages to your normal (private) email. Conveniently create a different GishPuppy email everytime you register on the web, and individually cancel them whenever you want.
Get Jetable Mail. The jetablemail extension provides an easy way to create temporary aliases on your e-mail addresses. You can use them on websites that require a valid mail to send a confirmation.