Really quickly, Mailinator is a free, disposable email service: http://mailinator.com/
Basically, it’s a free email service that’s built to be disposable. Anyone can access an email account there, no need to log in, just enter an email address (email@example.com) and you’ll have an instant email box for that address.
What’s the point?
Well, for services requiring an email address, you can check them out using a mailinator.com address. No need to give out your real email to try something out.
I thought so, I just didn’t realize lots of other people thought so to. 🙂
UPDATE: Just posting this here since Mailinator’s developer made a #1 posting at Hackernews with this: http://mailinator.blogspot.com/2011/05/how-to-get-gmailcom-banned-not-that-i.html