haha, this is great. Not that I'm doing to move my super-secret chocolate smuggling ring over to it or anything, but you know, when I need to send my ATM pin or something to someone it should be ok.
PGP Desktop has the only true "this message will self-destruct" feature, as far as I've seen.
PGP encrypted messages. Opened in a secure viewer. No copy and paste. No easy screenshotting (dx10 overlay if I'm not mistaken - bypassable, of course, but decent anyway). Close it and it's gone.
I'd pretty much guarantee that its real purpose is to serve as a simple but pleasant portfolio piece for a designer or developer, and that purpose isn't defeated by it being copyable.
But, I think the point of the service is that only one person can read it not that it can only be read once. They could prevent easy copying by using Flash, etc, but it that would be cruel, unusual (well, it should be usual), and wouldn't improve their offering.
I think the key in my statement was easy copying. The inability to copy and paste clearly frustrates people, seeing as its the number one complaint against Scribd. But thanks for the sarcasm. ;)
I am not disappointed after having seen the website. I expected a fail in the security department. You can't really "self destruct" a message on the medium of a computer unless you have what amounts to some form of DRM.