what if your photos could self destruct?

I'm constantly reminding my teenagers that the "internet is permanent." Anything you post today could be seen by a future girlfriend, boss or family member. What's acceptable (or in style) today may look ridiculous five years from now.

So, 37 Signals has a wonderful idea. Blog, video and photo posts that expire with time. Wouldn't that be awesome? Think of the embarrassing stuff you could be putting on line. You know, like dressing up as if you were a member of a boy band. Just an idea.