The Register: "Staellium UK has come up with a "self-destruct" text messaging service it hopes will prove a hit with both businessmen dealing with sensitive information and celebrity love cheats. StealthText deletes SMS messages 40 seconds after they are read. Users of the service need to have a WAP-enabled mobile phone though only those sending texts need to download a StealthText applet."
They are talking about some spy nonsense as a potential application for the service, but sending SMS ads that delete themselves instead of crowding the limited inbox space wouldn't be a bad idea.