Clearly there other ways to do this, but I think commodifying it _might_ be interesting? If you want to test it out for free, enter the promo TELLTHETRUTH.
Mailinator is interesting and cool—I'm definitely going to use in the future—but it seems like just an inbox, not a way to send a message. Is that right?
Ah that's right. I was mixing up the services because there are so many. Anonymouse let's you send emails. There are a dozen or more of these services out there. I don't see much value here without additional features.