Omnivorous Surfer

These are sites which generate an e-mail address that will expire, good to have for some sites which require you to register. There are several, but the one I have used is mint email . Visiting the site generates a random email address which is automatically copied to your clipboard. The site will keep the address active for 4 hours; leave the window open and it will automatically update to show you any mail that comes to the email address. You can also return to the URL to see any messages that have been delivered if you close the window. There is even a robot that will automatically verify the email address for most websites, so you don't have to click on the URL link to verify it. Pretty cool!
There are other sites which will keep an address active for longer than 4 hours, but this one works well for me.