Bigstring

Bigstring offers a web-based IM that is completely secure and self-destructing. This means any message you send will disappear into the ether after it is sent. When you send a message, it disappears after a pre-set interval. Big String makes it go up in animated smoke, right on your screen.

The "self-destruct button" can be set to work either after a specific number of viewings or at a set time. Entertainment companies and musicians can protect their intellectual property by e-mailing a video of a performance or song that is viewable only once. Individuals can prevent the forwarding of personal videos that can become embarrassing fodder for the Internet. And videos that are time sensitive can be set to self-destruct at a specific time or day.

HiperLink: http://www.bigstring.com/