It’s Friday, so that means it’s time for a useful web tool. Today’s, however, has a few implications which you might like to consider. Mailinator is one of many online services which gives you a “disposable e-mail address” – useful if somebody requests your email address in order to get something, but you don’t want to give them your real one. Expect to see a lot more people in the future entering disposable addresses into your web forms unless you give them a really good reason to give you their real email address.